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-4(7x+7)/4=-21
We move all terms to the left:
-4(7x+7)/4-(-21)=0
We add all the numbers together, and all the variables
-4(7x+7)/4+21=0
We multiply all the terms by the denominator
-4(7x+7)+21*4=0
We add all the numbers together, and all the variables
-4(7x+7)+84=0
We multiply parentheses
-28x-28+84=0
We add all the numbers together, and all the variables
-28x+56=0
We move all terms containing x to the left, all other terms to the right
-28x=-56
x=-56/-28
x=+2
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