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-9u-49=-2(u-7)
We move all terms to the left:
-9u-49-(-2(u-7))=0
We calculate terms in parentheses: -(-2(u-7)), so:We get rid of parentheses
-2(u-7)
We multiply parentheses
-2u+14
Back to the equation:
-(-2u+14)
-9u+2u-14-49=0
We add all the numbers together, and all the variables
-7u-63=0
We move all terms containing u to the left, all other terms to the right
-7u=63
u=63/-7
u=-9
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