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9.1+u/7=-2.1
We move all terms to the left:
9.1+u/7-(-2.1)=0
We add all the numbers together, and all the variables
u/7+11.2=0
We multiply all the terms by the denominator
u+(11.2)*7=0
We add all the numbers together, and all the variables
u+78.4=0
We move all terms containing u to the left, all other terms to the right
u=-78.4
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