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u/3+16=42
We move all terms to the left:
u/3+16-(42)=0
We add all the numbers together, and all the variables
u/3-26=0
We multiply all the terms by the denominator
u-26*3=0
We add all the numbers together, and all the variables
u-78=0
We move all terms containing u to the left, all other terms to the right
u=78
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