8=4u+20

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Solution for 8=4u+20 equation: 



8=4u+20

We move all terms to the left:

8-(4u+20)=0

We get rid of parentheses

-4u-20+8=0

We add all the numbers together, and all the variables

-4u-12=0

We move all terms containing u to the left, all other terms to the right

-4u=12

u=12/-4

u=-3

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