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-18+2u=6+4u
We move all terms to the left:
-18+2u-(6+4u)=0
We add all the numbers together, and all the variables
2u-(4u+6)-18=0
We get rid of parentheses
2u-4u-6-18=0
We add all the numbers together, and all the variables
-2u-24=0
We move all terms containing u to the left, all other terms to the right
-2u=24
u=24/-2
u=-12
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