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8=5u+3u
We move all terms to the left:
8-(5u+3u)=0
We add all the numbers together, and all the variables
-(+8u)+8=0
We get rid of parentheses
-8u+8=0
We move all terms containing u to the left, all other terms to the right
-8u=-8
u=-8/-8
u=1
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