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86=-8x+7(-3x+4)
We move all terms to the left:
86-(-8x+7(-3x+4))=0
We calculate terms in parentheses: -(-8x+7(-3x+4)), so:We get rid of parentheses
-8x+7(-3x+4)
We multiply parentheses
-8x-21x+28
We add all the numbers together, and all the variables
-29x+28
Back to the equation:
-(-29x+28)
29x-28+86=0
We add all the numbers together, and all the variables
29x+58=0
We move all terms containing x to the left, all other terms to the right
29x=-58
x=-58/29
x=-2
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