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400=2*128+2w
We simplify the equation to the form, which is simple to understand
400=2*128+2w
We move all terms containing w to the left and all other terms to the right.
-2w=+256-400
We simplify left and right side of the equation.
-2w=-144
We divide both sides of the equation by -02 to get w.
w=72
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