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3u-50=5u-92
We move all terms to the left:
3u-50-(5u-92)=0
We get rid of parentheses
3u-5u+92-50=0
We add all the numbers together, and all the variables
-2u+42=0
We move all terms containing u to the left, all other terms to the right
-2u=-42
u=-42/-2
u=+21
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