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5u-42=-8(u+2)
We move all terms to the left:
5u-42-(-8(u+2))=0
We calculate terms in parentheses: -(-8(u+2)), so:We get rid of parentheses
-8(u+2)
We multiply parentheses
-8u-16
Back to the equation:
-(-8u-16)
5u+8u+16-42=0
We add all the numbers together, and all the variables
13u-26=0
We move all terms containing u to the left, all other terms to the right
13u=26
u=26/13
u=2
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