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-7+7x=-4x+15
We move all terms to the left:
-7+7x-(-4x+15)=0
We get rid of parentheses
7x+4x-15-7=0
We add all the numbers together, and all the variables
11x-22=0
We move all terms containing x to the left, all other terms to the right
11x=22
x=22/11
x=2
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