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H in (-oo:+oo)
H/4 = (H+12)/12 // - (H+12)/12
H/4-((H+12)/12) = 0
(-1*(H+12))/12+H/4 = 0
(-1*4*(H+12))/(4*12)+(12*H)/(4*12) = 0
12*H-1*4*(H+12) = 0
8*H-48 = 0
(8*H-48)/(4*12) = 0
(8*H-48)/(4*12) = 0 // * 4*12
8*H-48 = 0
8*H-48 = 0 // + 48
8*H = 48 // : 8
H = 48/8
H = 6
H = 6
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