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