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15=-15-18u
We move all terms to the left:
15-(-15-18u)=0
We add all the numbers together, and all the variables
-(-18u-15)+15=0
We get rid of parentheses
18u+15+15=0
We add all the numbers together, and all the variables
18u+30=0
We move all terms containing u to the left, all other terms to the right
18u=-30
u=-30/18
u=-1+2/3
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