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h in (-oo:+oo)
24 = 4*(-h/2-7) // - 4*(-h/2-7)
24-(4*(-h/2-7)) = 0
24-4*(-h/2-7) = 0
24-4*(-1/2*h-7) = 0
24-4*(-1/2*h-7) = 0
2*h+52 = 0
2*h+52 = 0
2*h+52 = 0 // - 52
2*h = -52 // : 2
h = -52/2
h = -26
h = -26
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