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