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u+50=10u-40
We move all terms to the left:
u+50-(10u-40)=0
We get rid of parentheses
u-10u+40+50=0
We add all the numbers together, and all the variables
-9u+90=0
We move all terms containing u to the left, all other terms to the right
-9u=-90
u=-90/-9
u=+10
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