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-u+20=9u-20
We move all terms to the left:
-u+20-(9u-20)=0
We add all the numbers together, and all the variables
-1u-(9u-20)+20=0
We get rid of parentheses
-1u-9u+20+20=0
We add all the numbers together, and all the variables
-10u+40=0
We move all terms containing u to the left, all other terms to the right
-10u=-40
u=-40/-10
u=+4
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