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3+10u=4u-9+3u
We move all terms to the left:
3+10u-(4u-9+3u)=0
We add all the numbers together, and all the variables
10u-(7u-9)+3=0
We get rid of parentheses
10u-7u+9+3=0
We add all the numbers together, and all the variables
3u+12=0
We move all terms containing u to the left, all other terms to the right
3u=-12
u=-12/3
u=-4
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