y-21=-1

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Solution for y-21=-1 equation:


y-21=-1

We simplify the equation to the form, which is simple to understand 
y-21=-1

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

We simplify left and right side of the equation. 
+1y=+20

We divide both sides of the equation by 1 to get y. 
y=20

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