(80-2.5y)+y=50

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Solution for (80-2.5y)+y=50 equation: 



(80-2.5y)+y=50

We move all terms to the left:

(80-2.5y)+y-(50)=0

We add all the numbers together, and all the variables

(-2.5y+80)+y-50=0

We add all the numbers together, and all the variables

y+(-2.5y+80)-50=0

We get rid of parentheses

y-2.5y+80-50=0

We add all the numbers together, and all the variables

-1.5y+30=0

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

-1.5y=-30

y=-30/-1.5

y=+20

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