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