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4+5.8u=-48.2
We move all terms to the left:
4+5.8u-(-48.2)=0
We add all the numbers together, and all the variables
5.8u+52.2=0
We move all terms containing u to the left, all other terms to the right
5.8u=-52.2
u=-52.2/5.8
u=-9+7.1054273576E-15/5.8
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