w-12=9

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Solution for w-12=9 equation:


w-12=9

We simplify the equation to the form, which is simple to understand 
w-12=9

We move all terms containing w to the left and all other terms to the right. 
+1w=+9+12

We simplify left and right side of the equation. 
+1w=+21

We divide both sides of the equation by 1 to get w. 
w=21

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