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3x+6≠0 ∧ x²-7x≠0
3x≠-6 I:3 x(x-7)≠0
x≠-2 x≠0 ∧ x-7≠0
x≠7
Założenie: x≠{ -2,0,7)
(x^2-49) / (3x+6) ) * ((x+2) / (x^2-7x))=
(x²-7²) / [3(x+2)] * (x+2) / [ x(x-7)] =
[(x-7)(x+7)] / [3(x+2)] * (x+2) / [ x(x-7)]= skracamy 'na ukos'
(x+7) / 3x
ZAŁOŻENIE X≠-2 ,X≠0 i x≠7