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0.81u-0.37u+1.4=3.43
We move all terms to the left:
0.81u-0.37u+1.4-(3.43)=0
We add all the numbers together, and all the variables
0.44u-2.03=0
We move all terms containing u to the left, all other terms to the right
0.44u=2.03
u=2.03/0.44
u=4+0.27/0.44
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