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9.1+u/7=-8.4
We move all terms to the left:
9.1+u/7-(-8.4)=0
We add all the numbers together, and all the variables
u/7+17.5=0
We multiply all the terms by the denominator
u+(17.5)*7=0
We add all the numbers together, and all the variables
u+122.5=0
We move all terms containing u to the left, all other terms to the right
u=-122.5
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