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h in (-oo:+oo)
1-(2*(5-(2*h))) = h/2 // - h/2
1-(2*(5-(2*h)))-(h/2) = 0
1-2*(5-2*h)-(h/2) = 0
1-2*(5-2*h)-h/2 = 0
(-2*2*(5-2*h))/2-h/2+(1*2)/2 = 0
1*2-2*2*(5-2*h)-h = 0
7*h-20+2 = 0
7*h-18 = 0
(7*h-18)/2 = 0
(7*h-18)/2 = 0 // * 2
7*h-18 = 0
7*h-18 = 0 // + 18
7*h = 18 // : 7
h = 18/7
h = 18/7
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