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5u+30=-3u-18
We move all terms to the left:
5u+30-(-3u-18)=0
We get rid of parentheses
5u+3u+18+30=0
We add all the numbers together, and all the variables
8u+48=0
We move all terms containing u to the left, all other terms to the right
8u=-48
u=-48/8
u=-6
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