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y in (-oo:+oo)
y/0.9 = -2 // + 2
y/0.9+2 = 0
1.11111111*y+2 = 0 // - 2
1.11111111*y = -2 // : 1.11111111
y = -2/1.11111111
y = -1.8
y = -1.8
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