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4u-8.7=4.1
We move all terms to the left:
4u-8.7-(4.1)=0
We add all the numbers together, and all the variables
4u-12.8=0
We move all terms containing u to the left, all other terms to the right
4u=12.8
u=12.8/4
u=3+0.8/4
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