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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))) = 7 // - 7
-(2/(5-(3*h)))-7 = 0
-2*(5-3*h)^-1-7 = 0
-2/(5-3*h)-7 = 0
(-7*(5-3*h))/(5-3*h)-2/(5-3*h) = 0
-7*(5-3*h)-2 = 0
21*h-37 = 0
(21*h-37)/(5-3*h) = 0
(21*h-37)/(5-3*h) = 0 // * 5-3*h
21*h-37 = 0
21*h-37 = 0 // + 37
21*h = 37 // : 21
h = 37/21
h = 37/21
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