(y+20)*0.45=90

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Solution for (y+20)*0.45=90 equation: 



(y+20)*0.45=90

We move all terms to the left:

(y+20)*0.45-(90)=0

We multiply parentheses

0.45y+9-90=0

We add all the numbers together, and all the variables

0.45y-81=0

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

0.45y=81

y=81/0.45

y=180

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