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u+20+u+19=u+50
We move all terms to the left:
u+20+u+19-(u+50)=0
We add all the numbers together, and all the variables
2u-(u+50)+39=0
We get rid of parentheses
2u-u-50+39=0
We add all the numbers together, and all the variables
u-11=0
We move all terms containing u to the left, all other terms to the right
u=11
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