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77=-7(x-6)
We move all terms to the left:
77-(-7(x-6))=0
We calculate terms in parentheses: -(-7(x-6)), so:We get rid of parentheses
-7(x-6)
We multiply parentheses
-7x+42
Back to the equation:
-(-7x+42)
7x-42+77=0
We add all the numbers together, and all the variables
7x+35=0
We move all terms containing x to the left, all other terms to the right
7x=-35
x=-35/7
x=-5
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