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u/4-12=18
We move all terms to the left:
u/4-12-(18)=0
We add all the numbers together, and all the variables
u/4-30=0
We multiply all the terms by the denominator
u-30*4=0
We add all the numbers together, and all the variables
u-120=0
We move all terms containing u to the left, all other terms to the right
u=120
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