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(25-u)+u=25
We move all terms to the left:
(25-u)+u-(25)=0
We add all the numbers together, and all the variables
(-1u+25)+u-25=0
We add all the numbers together, and all the variables
u+(-1u+25)-25=0
We get rid of parentheses
u-1u+25-25=0
We add all the numbers together, and all the variables
=0
u=0/1
u=0
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