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x in (-oo:+oo)
y = (-23/9)*x-19 // - (-23/9)*x-19
y-((-23/9)*x)+19 = 0
(23/9)*x+y+19 = 0
23/9*x+y+19 = 0 // - y+19
23/9*x = -(y+19) // : 23/9
x = (-(y+19))/23/9
x = -9/23*(y+19)
x = -9/23*(y+19)
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