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7-10x=-15x+77
We move all terms to the left:
7-10x-(-15x+77)=0
We get rid of parentheses
-10x+15x-77+7=0
We add all the numbers together, and all the variables
5x-70=0
We move all terms containing x to the left, all other terms to the right
5x=70
x=70/5
x=14
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