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-2x+12+9x=7x-4x
We move all terms to the left:
-2x+12+9x-(7x-4x)=0
We add all the numbers together, and all the variables
-2x+9x-(+3x)+12=0
We add all the numbers together, and all the variables
7x-(+3x)+12=0
We get rid of parentheses
7x-3x+12=0
We add all the numbers together, and all the variables
4x+12=0
We move all terms containing x to the left, all other terms to the right
4x=-12
x=-12/4
x=-3
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