u=40-4u

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Solution for u=40-4u equation: 



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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