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x in (-oo:+oo)
y-2 = (-4/9)*(x+1) // - (-4/9)*(x+1)
y-((-4/9)*(x+1))-2 = 0
(4/9)*(x+1)+y-2 = 0
4/9*(x+1)+y-2 = 0
4/9*(x+1)+y-2 = 0
4/9*x+y-2+4/9 = 0
4/9*x+y-14/9 = 0
4/9*x+y-14/9 = 0
4/9*x+y-14/9 = 0 // - y-14/9
4/9*x = -(y-14/9) // : 4/9
x = (-(y-14/9))/4/9
x = 9/4*(14/9-y)
x = 9/4*(14/9-y)
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