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41=u/3+12
We move all terms to the left:
41-(u/3+12)=0
We get rid of parentheses
-u/3-12+41=0
We multiply all the terms by the denominator
-u-12*3+41*3=0
We add all the numbers together, and all the variables
-1u+87=0
We move all terms containing u to the left, all other terms to the right
-u=-87
u=-87/-1
u=+87
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