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4u+15=-3(u+2)
We move all terms to the left:
4u+15-(-3(u+2))=0
We calculate terms in parentheses: -(-3(u+2)), so:We get rid of parentheses
-3(u+2)
We multiply parentheses
-3u-6
Back to the equation:
-(-3u-6)
4u+3u+6+15=0
We add all the numbers together, and all the variables
7u+21=0
We move all terms containing u to the left, all other terms to the right
7u=-21
u=-21/7
u=-3
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