21=1-2y

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Solution for 21=1-2y equation: 



21=1-2y

We move all terms to the left:

21-(1-2y)=0

We add all the numbers together, and all the variables

-(-2y+1)+21=0

We get rid of parentheses

2y-1+21=0

We add all the numbers together, and all the variables

2y+20=0

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

2y=-20

y=-20/2

y=-10

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