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7.8u-16.39=16.39=16.29+15.4u
We move all terms to the left:
7.8u-16.39-(16.39)=0
We add all the numbers together, and all the variables
7.8u-32.78=0
We move all terms containing u to the left, all other terms to the right
7.8u=32.78
u=32.78/7.8
u=4+1/4.9367088607595
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