21y+40-56y=9y-21+36y

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Solution for 21y+40-56y=9y-21+36y equation: 



21y+40-56y=9y-21+36y

We move all terms to the left:

21y+40-56y-(9y-21+36y)=0

We add all the numbers together, and all the variables

21y-56y-(45y-21)+40=0

We add all the numbers together, and all the variables

-35y-(45y-21)+40=0

We get rid of parentheses

-35y-45y+21+40=0

We add all the numbers together, and all the variables

-80y+61=0

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

-80y=-61

y=-61/-80

y=61/80

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