y=90+.9y

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Solution for y=90+.9y equation: 



y=90+.9y

We move all terms to the left:

y-(90+.9y)=0

We add all the numbers together, and all the variables

y-(.9y+90)=0

We get rid of parentheses

y-.9y-90=0

We add all the numbers together, and all the variables

0.1y-90=0

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

0.1y=90

y=90/0.1

y=900

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