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