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2(u-6)+8u=18
We move all terms to the left:
2(u-6)+8u-(18)=0
We add all the numbers together, and all the variables
8u+2(u-6)-18=0
We multiply parentheses
8u+2u-12-18=0
We add all the numbers together, and all the variables
10u-30=0
We move all terms containing u to the left, all other terms to the right
10u=30
u=30/10
u=3
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