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-15=-5(u+1)
We move all terms to the left:
-15-(-5(u+1))=0
We calculate terms in parentheses: -(-5(u+1)), so:We get rid of parentheses
-5(u+1)
We multiply parentheses
-5u-5
Back to the equation:
-(-5u-5)
5u+5-15=0
We add all the numbers together, and all the variables
5u-10=0
We move all terms containing u to the left, all other terms to the right
5u=10
u=10/5
u=2
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