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2u+18=-4u-12
We move all terms to the left:
2u+18-(-4u-12)=0
We get rid of parentheses
2u+4u+12+18=0
We add all the numbers together, and all the variables
6u+30=0
We move all terms containing u to the left, all other terms to the right
6u=-30
u=-30/6
u=-5
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