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x in (-oo:+oo)
2*X-(5*Y) = -2.1/2 // + -2.1/2
2*X-(5*Y)-(-2.1/2) = 0
2*X-5*Y+1.05 = 0
2*X-5*Y+1.05 = 0
x należy do R
x in (-oo:+oo)
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