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u=40-4u
We move all terms to the left:
u-(40-4u)=0
We add all the numbers together, and all the variables
u-(-4u+40)=0
We get rid of parentheses
u+4u-40=0
We add all the numbers together, and all the variables
5u-40=0
We move all terms containing u to the left, all other terms to the right
5u=40
u=40/5
u=8
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