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3w-6w=21
We simplify the equation to the form, which is simple to understand
3w-6w=21
We move all terms containing w to the left and all other terms to the right.
+3w-6w=+21
We simplify left and right side of the equation.
-3w=+21
We divide both sides of the equation by -3 to get w.
w=-7
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