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Y in (-oo:+oo)
Y/9 = -9/1 // + -9/1
Y/9-(-9/1) = 0
Y/9+9 = 0
1/9*Y+9 = 0 // - 9
1/9*Y = -9 // : 1/9
Y = -9/1/9
Y = -81
Y = -81
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