4=0.8y

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Solution for 4=0.8y equation: 



4=0.8y

We move all terms to the left:

4-(0.8y)=0

We add all the numbers together, and all the variables

-(+0.8y)+4=0

We get rid of parentheses

-0.8y+4=0

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

-0.8y=-4

y=-4/-0.8

y=+5

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