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10.35+2.3u=-9.2
We move all terms to the left:
10.35+2.3u-(-9.2)=0
We add all the numbers together, and all the variables
2.3u+19.55=0
We move all terms containing u to the left, all other terms to the right
2.3u=-19.55
u=-19.55/2.3
u=-8+1/2
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