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2u+3=10+3u
We move all terms to the left:
2u+3-(10+3u)=0
We add all the numbers together, and all the variables
2u-(3u+10)+3=0
We get rid of parentheses
2u-3u-10+3=0
We add all the numbers together, and all the variables
-1u-7=0
We move all terms containing u to the left, all other terms to the right
-u=7
u=7/-1
u=-7
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