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x in (-oo:+oo)
(1/7)*sin(7*x) = 0
1/7 = 0
1/7 = 0
x belongs to the empty set
sin(7*x) = 0
sin(7*x) = 0 <=> 7*x = pi*k_1 i k_1 należy do I
t_1 = pi*k_1
7*x-t_1 = 0
7*x-t_1 = 0 // + t_1
7*x = t_1 // : 7
x = t_1/7
x = pi*k_1/7 i k_1 należy do I
(1/7)*sin(7*x) = 0 <=> 1/7 = 0 or (1/7)*sin(7*x) = 0 <=> sin(7*x) = 0
x = pi*k_1/7
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