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7u-37=-2(u-4)
We move all terms to the left:
7u-37-(-2(u-4))=0
We calculate terms in parentheses: -(-2(u-4)), so:We get rid of parentheses
-2(u-4)
We multiply parentheses
-2u+8
Back to the equation:
-(-2u+8)
7u+2u-8-37=0
We add all the numbers together, and all the variables
9u-45=0
We move all terms containing u to the left, all other terms to the right
9u=45
u=45/9
u=5
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