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