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-10u-25=21u-75
We move all terms to the left:
-10u-25-(21u-75)=0
We get rid of parentheses
-10u-21u+75-25=0
We add all the numbers together, and all the variables
-31u+50=0
We move all terms containing u to the left, all other terms to the right
-31u=-50
u=-50/-31
u=1+19/31
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