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