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h in (-oo:+oo)
(1/2)*(5-(2*h)) = (1/2)*h // - (1/2)*h
(1/2)*(5-(2*h))-((1/2)*h) = 0
(1/2)*(5-2*h)+(-1/2)*h = 0
1/2*(5-2*h)-h/2 = 0
(1/2*2*(5-2*h))/2-h/2 = 0
1/2*2*(5-2*h)-h = 0
5-3*h = 0
(5-3*h)/2 = 0
(5-3*h)/2 = 0 // * 2
5-3*h = 0
5-3*h = 0 // - 5
-3*h = -5 // : -3
h = -5/(-3)
h = 5/3
h = 5/3
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