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