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u/4-17=21
We move all terms to the left:
u/4-17-(21)=0
We add all the numbers together, and all the variables
u/4-38=0
We multiply all the terms by the denominator
u-38*4=0
We add all the numbers together, and all the variables
u-152=0
We move all terms containing u to the left, all other terms to the right
u=152
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