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3x-x+2=7x+12
We move all terms to the left:
3x-x+2-(7x+12)=0
We add all the numbers together, and all the variables
2x-(7x+12)+2=0
We get rid of parentheses
2x-7x-12+2=0
We add all the numbers together, and all the variables
-5x-10=0
We move all terms containing x to the left, all other terms to the right
-5x=10
x=10/-5
x=-2
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