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-60u-20=21u-3
We move all terms to the left:
-60u-20-(21u-3)=0
We get rid of parentheses
-60u-21u+3-20=0
We add all the numbers together, and all the variables
-81u-17=0
We move all terms containing u to the left, all other terms to the right
-81u=17
u=17/-81
u=-17/81
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