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(100+u)-20=5+u
We move all terms to the left:
(100+u)-20-(5+u)=0
We add all the numbers together, and all the variables
(u+100)-(u+5)-20=0
We get rid of parentheses
u-u+100-5-20=0
We add all the numbers together, and all the variables
75!=0
There is no solution for this equation
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