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2.3=3u-7.3
We move all terms to the left:
2.3-(3u-7.3)=0
We get rid of parentheses
-3u+7.3+2.3=0
We add all the numbers together, and all the variables
-3u+9.6=0
We move all terms containing u to the left, all other terms to the right
-3u=-9.6
u=-9.6/-3
u=3+0.6/3
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