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78=9w-7w+6
We simplify the equation to the form, which is simple to understand
78=9w-7w+6
We move all terms containing w to the left and all other terms to the right.
-9w+7w=+6-78
We simplify left and right side of the equation.
-2w=-72
We divide both sides of the equation by -2 to get w.
w=36
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