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-7(5x-5)=520
We move all terms to the left:
-7(5x-5)-(520)=0
We multiply parentheses
-35x+35-520=0
We add all the numbers together, and all the variables
-35x-485=0
We move all terms containing x to the left, all other terms to the right
-35x=485
x=485/-35
x=-13+6/7
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