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-5x+3(-7x-7)=135
We move all terms to the left:
-5x+3(-7x-7)-(135)=0
We multiply parentheses
-5x-21x-21-135=0
We add all the numbers together, and all the variables
-26x-156=0
We move all terms containing x to the left, all other terms to the right
-26x=156
x=156/-26
x=-6
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