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9u+20=15u+14
We move all terms to the left:
9u+20-(15u+14)=0
We get rid of parentheses
9u-15u-14+20=0
We add all the numbers together, and all the variables
-6u+6=0
We move all terms containing u to the left, all other terms to the right
-6u=-6
u=-6/-6
u=1
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