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5u-43=-6(u+9)
We move all terms to the left:
5u-43-(-6(u+9))=0
We calculate terms in parentheses: -(-6(u+9)), so:We get rid of parentheses
-6(u+9)
We multiply parentheses
-6u-54
Back to the equation:
-(-6u-54)
5u+6u+54-43=0
We add all the numbers together, and all the variables
11u+11=0
We move all terms containing u to the left, all other terms to the right
11u=-11
u=-11/11
u=-1
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