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4u-7=2u+1
We move all terms to the left:
4u-7-(2u+1)=0
We get rid of parentheses
4u-2u-1-7=0
We add all the numbers together, and all the variables
2u-8=0
We move all terms containing u to the left, all other terms to the right
2u=8
u=8/2
u=4
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