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-3.1+u/2=-15.9
We move all terms to the left:
-3.1+u/2-(-15.9)=0
We add all the numbers together, and all the variables
u/2+12.8=0
We multiply all the terms by the denominator
u+(12.8)*2=0
We add all the numbers together, and all the variables
u+25.6=0
We move all terms containing u to the left, all other terms to the right
u=-25.6
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