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x in (-oo:+oo)
W/4-7 = x // - x
W/4-x-7 = 0
1/4*W-x-7 = 0 // - 1/4*W-7
-x = -(1/4*W-7) // * -1
x = 1/4*W-7
x = 1/4*W-7
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