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x in (-oo:+oo)
y+5 = (-12/5)*x-15 // - (-12/5)*x-15
y-((-12/5)*x)+5+15 = 0
(12/5)*x+y+5+15 = 0
12/5*x+y+20 = 0 // - y+20
12/5*x = -(y+20) // : 12/5
x = (-(y+20))/12/5
x = -5/12*(y+20)
x = -5/12*(y+20)
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