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105=5u+12
We move all terms to the left:
105-(5u+12)=0
We get rid of parentheses
-5u-12+105=0
We add all the numbers together, and all the variables
-5u+93=0
We move all terms containing u to the left, all other terms to the right
-5u=-93
u=-93/-5
u=18+3/5
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