9w-21=-3(-3w+7)

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Solution for 9w-21=-3(-3w+7) equation:


9w-21=-3(-3w+7)

We simplify the equation to the form, which is simple to understand 
9w-21=-3(-3w+7)

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

Remove unnecessary parentheses
+9w-21=+9w-21

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

We simplify left and right side of the equation. 
w=0

0=0

This equation is an identity, so all real numbers are solutions.

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