21=y-20

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Solution for 21=y-20 equation:


21=y-20

We simplify the equation to the form, which is simple to understand 
21=y-20

We move all terms containing y to the left and all other terms to the right. 
-1y=-20-21

We simplify left and right side of the equation. 
-1y=-41

We divide both sides of the equation by -01 to get y. 
y=41

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