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5u-20=-6(u+7)
We move all terms to the left:
5u-20-(-6(u+7))=0
We calculate terms in parentheses: -(-6(u+7)), so:We get rid of parentheses
-6(u+7)
We multiply parentheses
-6u-42
Back to the equation:
-(-6u-42)
5u+6u+42-20=0
We add all the numbers together, and all the variables
11u+22=0
We move all terms containing u to the left, all other terms to the right
11u=-22
u=-22/11
u=-2
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