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7x+49=-7(x+9)
We move all terms to the left:
7x+49-(-7(x+9))=0
We calculate terms in parentheses: -(-7(x+9)), so:We get rid of parentheses
-7(x+9)
We multiply parentheses
-7x-63
Back to the equation:
-(-7x-63)
7x+7x+63+49=0
We add all the numbers together, and all the variables
14x+112=0
We move all terms containing x to the left, all other terms to the right
14x=-112
x=-112/14
x=-8
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