3(7)-y=9

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Solution for 3(7)-y=9 equation:


3(7)-y=9

We simplify the equation to the form, which is simple to understand 
3(7)-y=9

Reorder the terms in parentheses
+(+21)-y=9

Remove unnecessary parentheses
+21-y=+9

We move all terms containing y to the left and all other terms to the right. 
-1y=+9-21

We simplify left and right side of the equation. 
-1y=-12

We divide both sides of the equation by -1 to get y. 
y=12

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