1-4y=y+21

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Solution for 1-4y=y+21 equation: 



1-4y=y+21

We move all terms to the left:

1-4y-(y+21)=0

We get rid of parentheses

-4y-y-21+1=0

We add all the numbers together, and all the variables

-5y-20=0

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

-5y=20

y=20/-5

y=-4

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