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h in (-oo:+oo)
h/4-((h-1)/8) = 9/8 // - 9/8
h/4-((h-1)/8)-(9/8) = 0
h/4-((h-1)/8)-9/8 = 0
(-1*(h-1))/8+h/4-9/8 = 0
(-1*4*(h-1))/(4*8)+(8*h)/(4*8)+(-9*4)/(4*8) = 0
8*h-1*4*(h-1)-9*4 = 0
4*h-36+4 = 0
4*h-32 = 0
(4*h-32)/(4*8) = 0
(4*h-32)/(4*8) = 0 // * 4*8
4*h-32 = 0
4*h-32 = 0 // + 32
4*h = 32 // : 4
h = 32/4
h = 8
h = 8
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