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5.1+u/3=-2.4
We move all terms to the left:
5.1+u/3-(-2.4)=0
We add all the numbers together, and all the variables
u/3+7.5=0
We multiply all the terms by the denominator
u+(7.5)*3=0
We add all the numbers together, and all the variables
u+22.5=0
We move all terms containing u to the left, all other terms to the right
u=-22.5
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