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-84=7(-4x+8)
We move all terms to the left:
-84-(7(-4x+8))=0
We calculate terms in parentheses: -(7(-4x+8)), so:We get rid of parentheses
7(-4x+8)
We multiply parentheses
-28x+56
Back to the equation:
-(-28x+56)
28x-56-84=0
We add all the numbers together, and all the variables
28x-140=0
We move all terms containing x to the left, all other terms to the right
28x=140
x=140/28
x=5
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