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