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x in (-oo:+oo)
w/2-14 = x // - x
w/2-x-14 = 0
1/2*w-x-14 = 0 // - 1/2*w-14
-x = -(1/2*w-14) // * -1
x = 1/2*w-14
x = 1/2*w-14
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