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40=5u+3u
We move all terms to the left:
40-(5u+3u)=0
We add all the numbers together, and all the variables
-(+8u)+40=0
We get rid of parentheses
-8u+40=0
We move all terms containing u to the left, all other terms to the right
-8u=-40
u=-40/-8
u=+5
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