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h in (-oo:+oo)
(1/3)*(12-(9*h)) = 4-(3*h) // - 4-(3*h)
(1/3)*(12-(9*h))+3*h-4 = 0
(1/3)*(12-9*h)+3*h-4 = 0
1/3*(12-9*h)+3*h-4 = 0
1/3*(12-9*h)+3*h-4 = 0
4-4 = 0
0 = 0
0 = 0
0 = 0
h należy do R
h in (-oo:+oo)
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