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u/5-3.1=-15.6
We move all terms to the left:
u/5-3.1-(-15.6)=0
We add all the numbers together, and all the variables
u/5+12.5=0
We multiply all the terms by the denominator
u+(12.5)*5=0
We add all the numbers together, and all the variables
u+62.5=0
We move all terms containing u to the left, all other terms to the right
u=-62.5
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