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2u-4=5u+1-7u
We move all terms to the left:
2u-4-(5u+1-7u)=0
We add all the numbers together, and all the variables
2u-(-2u+1)-4=0
We get rid of parentheses
2u+2u-1-4=0
We add all the numbers together, and all the variables
4u-5=0
We move all terms containing u to the left, all other terms to the right
4u=5
u=5/4
u=1+1/4
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