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102=5u+12
We move all terms to the left:
102-(5u+12)=0
We get rid of parentheses
-5u-12+102=0
We add all the numbers together, and all the variables
-5u+90=0
We move all terms containing u to the left, all other terms to the right
-5u=-90
u=-90/-5
u=+18
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