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6u+3=23+u
We move all terms to the left:
6u+3-(23+u)=0
We add all the numbers together, and all the variables
6u-(u+23)+3=0
We get rid of parentheses
6u-u-23+3=0
We add all the numbers together, and all the variables
5u-20=0
We move all terms containing u to the left, all other terms to the right
5u=20
u=20/5
u=4
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