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x in (-oo:+oo)
(1/2)*y-((2/3)*x) = 4 // - 4
(1/2)*y-((2/3)*x)-4 = 0
(-2/3)*x+(1/2)*y-4 = 0
1/2*y-2/3*x-4 = 0 // - 1/2*y-4
-2/3*x = -(1/2*y-4) // : -2/3
x = (-(1/2*y-4))/(-2/3)
x = -3/2*(4-(1/2*y))
x = -3/2*(4-(1/2*y))
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