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3.4+u/5=-9.1
We move all terms to the left:
3.4+u/5-(-9.1)=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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