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18=2(u-6)-7u
We move all terms to the left:
18-(2(u-6)-7u)=0
We calculate terms in parentheses: -(2(u-6)-7u), so:We get rid of parentheses
2(u-6)-7u
We add all the numbers together, and all the variables
-7u+2(u-6)
We multiply parentheses
-7u+2u-12
We add all the numbers together, and all the variables
-5u-12
Back to the equation:
-(-5u-12)
5u+12+18=0
We add all the numbers together, and all the variables
5u+30=0
We move all terms containing u to the left, all other terms to the right
5u=-30
u=-30/5
u=-6
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