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x in (-oo:+oo)
(2*x)/3-(6*x) = 2*y // - 2*y
(2*x)/3-(6*x)-(2*y) = 0
(2*x)/3-6*x-2*y = 0
-16/3*x-2*y = 0 // + -2*y
-16/3*x = -(-2*y) // : -16/3
x = (-(-2*y))/(-16/3)
x = -3/8*y
x = -3/8*y
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