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45=5u-12
We move all terms to the left:
45-(5u-12)=0
We get rid of parentheses
-5u+12+45=0
We add all the numbers together, and all the variables
-5u+57=0
We move all terms containing u to the left, all other terms to the right
-5u=-57
u=-57/-5
u=11+2/5
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