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-w+4w=15
We simplify the equation to the form, which is simple to understand
-w+4w=15
We move all terms containing w to the left and all other terms to the right.
-1w+4w=+15
We simplify left and right side of the equation.
+3w=+15
We divide both sides of the equation by 3 to get w.
w=5
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