X+12=3x-7-x=3x+173(x-3)=x+2(x+5)

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Let's solve for X step by step:

Combine like terms on both sides of the equation:
x + 12 = 3x - 7
Rearrange the equation:
x + 12 = 3x -7

Subtract x from both sides:
12 = 2x - 7

Add 7 to both sides:
19 = 2x

Divide by 2 on both sides:
x = 9.5

Therefore, the solution to the equation x + 12 = 3x - 7 is x = 9.5.