1=21-4y

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Solution for 1=21-4y equation:



1=21-4y
We move all terms to the left:
1-(21-4y)=0
We add all the numbers together, and all the variables
-(-4y+21)+1=0
We get rid of parentheses
4y-21+1=0
We add all the numbers together, and all the variables
4y-20=0
We move all terms containing y to the left, all other terms to the right
4y=20
y=20/4
y=5

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