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u/4-3.1=-9.5
We move all terms to the left:
u/4-3.1-(-9.5)=0
We add all the numbers together, and all the variables
u/4+6.4=0
We multiply all the terms by the denominator
u+(6.4)*4=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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