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4u-50=6u-90
We move all terms to the left:
4u-50-(6u-90)=0
We get rid of parentheses
4u-6u+90-50=0
We add all the numbers together, and all the variables
-2u+40=0
We move all terms containing u to the left, all other terms to the right
-2u=-40
u=-40/-2
u=+20
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