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-5u-28=-7(u+2)
We move all terms to the left:
-5u-28-(-7(u+2))=0
We calculate terms in parentheses: -(-7(u+2)), so:We get rid of parentheses
-7(u+2)
We multiply parentheses
-7u-14
Back to the equation:
-(-7u-14)
-5u+7u+14-28=0
We add all the numbers together, and all the variables
2u-14=0
We move all terms containing u to the left, all other terms to the right
2u=14
u=14/2
u=7
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