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5u=4+u
We move all terms to the left:
5u-(4+u)=0
We add all the numbers together, and all the variables
5u-(u+4)=0
We get rid of parentheses
5u-u-4=0
We add all the numbers together, and all the variables
4u-4=0
We move all terms containing u to the left, all other terms to the right
4u=4
u=4/4
u=1
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