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3u+90=10u+83
We move all terms to the left:
3u+90-(10u+83)=0
We get rid of parentheses
3u-10u-83+90=0
We add all the numbers together, and all the variables
-7u+7=0
We move all terms containing u to the left, all other terms to the right
-7u=-7
u=-7/-7
u=1
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