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x in (-oo:+oo)
y/(-3) = -t/4.5 // + -t/4.5
y/(-3)-(-t/4.5) = 0
0.22222222*t+y/(-3) = 0
0.22222222*t-1/3*y = 0
x należy do R
x in (-oo:+oo)
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