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-6(-64u-78)=-6(-2u-450)
We move all terms to the left:
-6(-64u-78)-(-6(-2u-450))=0
We multiply parentheses
384u-(-6(-2u-450))+468=0
We calculate terms in parentheses: -(-6(-2u-450)), so:We get rid of parentheses
-6(-2u-450)
We multiply parentheses
12u+2700
Back to the equation:
-(12u+2700)
384u-12u-2700+468=0
We add all the numbers together, and all the variables
372u-2232=0
We move all terms containing u to the left, all other terms to the right
372u=2232
u=2232/372
u=6
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