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-4u+16=-2(u+1)
We move all terms to the left:
-4u+16-(-2(u+1))=0
We calculate terms in parentheses: -(-2(u+1)), so:We get rid of parentheses
-2(u+1)
We multiply parentheses
-2u-2
Back to the equation:
-(-2u-2)
-4u+2u+2+16=0
We add all the numbers together, and all the variables
-2u+18=0
We move all terms containing u to the left, all other terms to the right
-2u=-18
u=-18/-2
u=+9
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