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84=7(-x+5)
We move all terms to the left:
84-(7(-x+5))=0
We add all the numbers together, and all the variables
-(7(-1x+5))+84=0
We calculate terms in parentheses: -(7(-1x+5)), so:We get rid of parentheses
7(-1x+5)
We multiply parentheses
-7x+35
Back to the equation:
-(-7x+35)
7x-35+84=0
We add all the numbers together, and all the variables
7x+49=0
We move all terms containing x to the left, all other terms to the right
7x=-49
x=-49/7
x=-7
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