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4u=72-5u
We move all terms to the left:
4u-(72-5u)=0
We add all the numbers together, and all the variables
4u-(-5u+72)=0
We get rid of parentheses
4u+5u-72=0
We add all the numbers together, and all the variables
9u-72=0
We move all terms containing u to the left, all other terms to the right
9u=72
u=72/9
u=8
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