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30=u/5+12
We move all terms to the left:
30-(u/5+12)=0
We get rid of parentheses
-u/5-12+30=0
We multiply all the terms by the denominator
-u-12*5+30*5=0
We add all the numbers together, and all the variables
-1u+90=0
We move all terms containing u to the left, all other terms to the right
-u=-90
u=-90/-1
u=+90
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