y-21=4y

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Solution for y-21=4y equation:


y-21=4y

We simplify the equation to the form, which is simple to understand 
y-21=4y

We move all terms containing y to the left and all other terms to the right. 
+1y-4y=+21

We simplify left and right side of the equation. 
-3y=+21

We divide both sides of the equation by -3 to get y. 
y=-7

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