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4.1u+8.8=3.9u+7
We move all terms to the left:
4.1u+8.8-(3.9u+7)=0
We get rid of parentheses
4.1u-3.9u-7+8.8=0
We add all the numbers together, and all the variables
0.2u+1.8=0
We move all terms containing u to the left, all other terms to the right
0.2u=-1.8
u=-1.8/0.2
u=-9
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