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30=14u-8u
We move all terms to the left:
30-(14u-8u)=0
We add all the numbers together, and all the variables
-(+6u)+30=0
We get rid of parentheses
-6u+30=0
We move all terms containing u to the left, all other terms to the right
-6u=-30
u=-30/-6
u=+5
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