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u=u-50+u-50
We move all terms to the left:
u-(u-50+u-50)=0
We add all the numbers together, and all the variables
u-(2u-100)=0
We get rid of parentheses
u-2u+100=0
We add all the numbers together, and all the variables
-1u+100=0
We move all terms containing u to the left, all other terms to the right
-u=-100
u=-100/-1
u=+100
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