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x in (-oo:+oo)
y-1 = (-4/3)*(x-1) // - (-4/3)*(x-1)
y-((-4/3)*(x-1))-1 = 0
(4/3)*(x-1)+y-1 = 0
4/3*(x-1)+y-1 = 0
4/3*(x-1)+y-1 = 0
4/3*x+y-4/3-1 = 0
4/3*x+y-7/3 = 0
4/3*x+y-7/3 = 0
4/3*x+y-7/3 = 0 // - y-7/3
4/3*x = -(y-7/3) // : 4/3
x = (-(y-7/3))/4/3
x = 3/4*(7/3-y)
x = 3/4*(7/3-y)
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