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6u-18=4(u-3)
We move all terms to the left:
6u-18-(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)
6u-4u+12-18=0
We add all the numbers together, and all the variables
2u-6=0
We move all terms containing u to the left, all other terms to the right
2u=6
u=6/2
u=3
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