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4u-75=2u-33
We move all terms to the left:
4u-75-(2u-33)=0
We get rid of parentheses
4u-2u+33-75=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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