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-12(u+4)=240
We move all terms to the left:
-12(u+4)-(240)=0
We multiply parentheses
-12u-48-240=0
We add all the numbers together, and all the variables
-12u-288=0
We move all terms containing u to the left, all other terms to the right
-12u=288
u=288/-12
u=-24
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