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30=u/4-12
We move all terms to the left:
30-(u/4-12)=0
We get rid of parentheses
-u/4+12+30=0
We multiply all the terms by the denominator
-u+12*4+30*4=0
We add all the numbers together, and all the variables
-1u+168=0
We move all terms containing u to the left, all other terms to the right
-u=-168
u=-168/-1
u=+168
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