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9u+28=4(u-3)
We move all terms to the left:
9u+28-(4(u-3))=0
We calculate terms in parentheses: -(4(u-3)), so:We get rid of parentheses
4(u-3)
We multiply parentheses
4u-12
Back to the equation:
-(4u-12)
9u-4u+12+28=0
We add all the numbers together, and all the variables
5u+40=0
We move all terms containing u to the left, all other terms to the right
5u=-40
u=-40/5
u=-8
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