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-10-7u=-2(5u-7)
We move all terms to the left:
-10-7u-(-2(5u-7))=0
We calculate terms in parentheses: -(-2(5u-7)), so:We get rid of parentheses
-2(5u-7)
We multiply parentheses
-10u+14
Back to the equation:
-(-10u+14)
-7u+10u-14-10=0
We add all the numbers together, and all the variables
3u-24=0
We move all terms containing u to the left, all other terms to the right
3u=24
u=24/3
u=8
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