21-20y=8+13

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Solution for 21-20y=8+13 equation: 



21-20y=8+13

We move all terms to the left:

21-20y-(8+13)=0

We add all the numbers together, and all the variables

-20y+21-21=0

We add all the numbers together, and all the variables

-20y=0

y=0/-20

y=0

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