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-3(x-7)=-7x-7
We move all terms to the left:
-3(x-7)-(-7x-7)=0
We multiply parentheses
-3x-(-7x-7)+21=0
We get rid of parentheses
-3x+7x+7+21=0
We add all the numbers together, and all the variables
4x+28=0
We move all terms containing x to the left, all other terms to the right
4x=-28
x=-28/4
x=-7
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