0.50(4.5)+0.20(9.0-y)=3.15

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Solution for 0.50(4.5)+0.20(9.0-y)=3.15 equation: 



0.50(4.5)+0.20(9.0-y)=3.15

We move all terms to the left:

0.50(4.5)+0.20(9.0-y)-(3.15)=0

We add all the numbers together, and all the variables

0.20(-1y+9)+0.50(4.5)-(3.15)=0

We add all the numbers together, and all the variables

0.20(-1y+9)-0.9=0

We multiply parentheses

-0.2y+1.8-0.9=0

We add all the numbers together, and all the variables

-0.2y+0.9=0

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

-0.2y=-0.9

y=-0.9/-0.2

y=4+0.1/0.2

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