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-3(u+5)=15
We move all terms to the left:
-3(u+5)-(15)=0
We multiply parentheses
-3u-15-15=0
We add all the numbers together, and all the variables
-3u-30=0
We move all terms containing u to the left, all other terms to the right
-3u=30
u=30/-3
u=-10
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