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8.7-4u=2.3
We move all terms to the left:
8.7-4u-(2.3)=0
We add all the numbers together, and all the variables
-4u+6.4=0
We move all terms containing u to the left, all other terms to the right
-4u=-6.4
u=-6.4/-4
u=1+1/1.6666666666667
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