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x in (-oo:+oo)
y-1 = (-2/3)*(x-2) // - (-2/3)*(x-2)
y-((-2/3)*(x-2))-1 = 0
(2/3)*(x-2)+y-1 = 0
2/3*(x-2)+y-1 = 0
2/3*(x-2)+y-1 = 0
2/3*x+y-4/3-1 = 0
2/3*x+y-7/3 = 0
2/3*x+y-7/3 = 0
2/3*x+y-7/3 = 0 // - y-7/3
2/3*x = -(y-7/3) // : 2/3
x = (-(y-7/3))/2/3
x = 3/2*(7/3-y)
x = 3/2*(7/3-y)
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