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12-24=9u+45
We move all terms to the left:
12-24-(9u+45)=0
We add all the numbers together, and all the variables
-(9u+45)-12=0
We get rid of parentheses
-9u-45-12=0
We add all the numbers together, and all the variables
-9u-57=0
We move all terms containing u to the left, all other terms to the right
-9u=57
u=57/-9
u=-6+1/3
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