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7u=8+5u
We move all terms to the left:
7u-(8+5u)=0
We add all the numbers together, and all the variables
7u-(5u+8)=0
We get rid of parentheses
7u-5u-8=0
We add all the numbers together, and all the variables
2u-8=0
We move all terms containing u to the left, all other terms to the right
2u=8
u=8/2
u=4
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