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h in (-oo:+oo)
(2/5)*(3*h-1)+8 = (-21/2)*(20-(3*h)) // - (-21/2)*(20-(3*h))
(2/5)*(3*h-1)-((-21/2)*(20-(3*h)))+8 = 0
(2/5)*(3*h-1)+(21/2)*(20-3*h)+8 = 0
2/5*(3*h-1)+21/2*(20-3*h)+8 = 0
2/5*(3*h-1)+21/2*(20-3*h)+8 = 0
8-303/10*h+1048/5 = 0
1088/5-303/10*h = 0
1088/5-303/10*h = 0
1088/5-303/10*h = 0 // - 1088/5
-303/10*h = -1088/5 // : -303/10
h = -1088/5/(-303/10)
h = 2176/303
h = 2176/303
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