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