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7x+12=-3x+2
We move all terms to the left:
7x+12-(-3x+2)=0
We get rid of parentheses
7x+3x-2+12=0
We add all the numbers together, and all the variables
10x+10=0
We move all terms containing x to the left, all other terms to the right
10x=-10
x=-10/10
x=-1
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