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7x-5(x-7)=-8x-13
We move all terms to the left:
7x-5(x-7)-(-8x-13)=0
We multiply parentheses
7x-5x-(-8x-13)+35=0
We get rid of parentheses
7x-5x+8x+13+35=0
We add all the numbers together, and all the variables
10x+48=0
We move all terms containing x to the left, all other terms to the right
10x=-48
x=-48/10
x=-4+4/5
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