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-3(u+23)=75
We move all terms to the left:
-3(u+23)-(75)=0
We multiply parentheses
-3u-69-75=0
We add all the numbers together, and all the variables
-3u-144=0
We move all terms containing u to the left, all other terms to the right
-3u=144
u=144/-3
u=-48
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