y=420+0.8y

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Solution for y=420+0.8y equation: 



y=420+0.8y

We move all terms to the left:

y-(420+0.8y)=0

We add all the numbers together, and all the variables

y-(0.8y+420)=0

We get rid of parentheses

y-0.8y-420=0

We add all the numbers together, and all the variables

0.2y-420=0

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

0.2y=420

y=420/0.2

y=2100

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