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-18-8u=18-6u
We move all terms to the left:
-18-8u-(18-6u)=0
We add all the numbers together, and all the variables
-8u-(-6u+18)-18=0
We get rid of parentheses
-8u+6u-18-18=0
We add all the numbers together, and all the variables
-2u-36=0
We move all terms containing u to the left, all other terms to the right
-2u=36
u=36/-2
u=-18
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