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12-5w-4w=15
We simplify the equation to the form, which is simple to understand
12-5w-4w=15
We move all terms containing w to the left and all other terms to the right.
-5w-4w=+15-12
We simplify left and right side of the equation.
-9w=+3
We divide both sides of the equation by -9 to get w.
w=-0.33333333333333
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