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5u-u=+15
We move all terms to the left:
5u-u-(+15)=0
We add all the numbers together, and all the variables
5u-u-15=0
We add all the numbers together, and all the variables
4u-15=0
We move all terms containing u to the left, all other terms to the right
4u=15
u=15/4
u=3+3/4
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