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D( h )
5-(3*h) = 0
5-(3*h) = 0
5-(3*h) = 0
5-3*h = 0
5-3*h = 0 // - 5
-3*h = -5 // : -3
h = -5/(-3)
h = 5/3
h in (-oo:5/3) U (5/3:+oo)
-2/(5-(3*h)) = 1 // - 1
-2/(5-(3*h))-1 = 0
-2/(5-3*h)-1 = 0
(-1*(5-3*h))/(5-3*h)-2/(5-3*h) = 0
-1*(5-3*h)-2 = 0
3*h-7 = 0
(3*h-7)/(5-3*h) = 0
(3*h-7)/(5-3*h) = 0 // * 5-3*h
3*h-7 = 0
3*h-7 = 0 // + 7
3*h = 7 // : 3
h = 7/3
h = 7/3
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