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