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1.01u-3.86u+2.87=3.71
We move all terms to the left:
1.01u-3.86u+2.87-(3.71)=0
We add all the numbers together, and all the variables
-2.85u-0.84=0
We move all terms containing u to the left, all other terms to the right
-2.85u=0.84
u=0.84/-2.85
u=-0.84/2.85
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