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-3u-6=u+30
We move all terms to the left:
-3u-6-(u+30)=0
We get rid of parentheses
-3u-u-30-6=0
We add all the numbers together, and all the variables
-4u-36=0
We move all terms containing u to the left, all other terms to the right
-4u=36
u=36/-4
u=-9
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