The solution of the equation 1 2 10x 3a 2 2 3x is known to be a prime number, find a

Solve x and then use the prime number condition to judge.

10x-3a)/2=2(2+3x)

Multiplication 2 on both sides of the equation: 10x-3a=8+12x

Find: x=(-3a-8) 2<0

Find: a>-8 3

x=-(8+3a) 2 is greater than or equal to 2 x is a prime number less than or equal to -4

The solution of the equation is known to be x = -1, so sliding the x band into the equation gives -1 2+3x-1=3.

The shift term is that there is a round beat 3x=3+1+2=6, and both sides are divided by 3 at the same time, and the solution is x=6 3=2.

Solution: Since x=5 is the solution of the equation 3x-2a=7 about x, then 3 5-2a=7 holds.

i.e. 15-2a=7

2a=15-7=8

a=4。A: The value of a is 4.

Observing the number of this series, it can be seen that the general formula of this series is an=5n, so it is missing, and the fifth term of the return hole of this congratulatory sequence is 25, followed by 30, 35, 40, 45, 50, .......

Solve the equation 2x+1=3 to get a width of x=1

Put x=1 into x+3a=7, get.

1+3a=7, Xie Shen takes the key, a=2

A: The value of a is 2

From the equation 3x-7=5, we get 3x=(12);

From Eq. -2 1x=-3, we get x=(6).

According to the title, substituting x=-1 into the equation can be obtained: -2-3a=7

Solution: a=-3

Therefore, which acacia fills: -3

2x+3=7

Then when x=2x=2, the equation: 2 2+1 3a=2-1

a=9,2,5/3

Substituting x 2 into the fiber base, 1,11 12,0,a is the value, the solution of the equation 2x+1 3a=x-1 satisfies 2x+3=7?

Why is the solution of the equation 2x+1 3a=x-1 satisfying 2x+3=7?

Before 5 o'clock, help and attack the vertical front.

Solution: 1 2ax+5=(7x-3) 2

1/2a+5=(7/2)x-3/2

1/2a-7/2)x=-3/2-5

x=(-3/2-5)/(1/2a-7/2)x=(13/2)/(7/2-1/2a)

x=13/(7-a)

Since x is a positive integer, 13 (7-a) is a positive integer, so 7-a=1,13, so a=6,-6