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7+u/4=3
We move all terms to the left:
7+u/4-(3)=0
We add all the numbers together, and all the variables
u/4+4=0
We multiply all the terms by the denominator
u+4*4=0
We add all the numbers together, and all the variables
u+16=0
We move all terms containing u to the left, all other terms to the right
u=-16
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