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8u=5u+30
We move all terms to the left:
8u-(5u+30)=0
We get rid of parentheses
8u-5u-30=0
We add all the numbers together, and all the variables
3u-30=0
We move all terms containing u to the left, all other terms to the right
3u=30
u=30/3
u=10
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