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x in (-oo:+oo)
y = (a/3)*x-6 // - (a/3)*x-6
y-((a/3)*x)+6 = 0
y-1/3*a*x+6 = 0 // - y+6
-1/3*a*x = -(y+6) // : -1/3*a
x = (-(y+6))/(-1/3*a)
x = 3*a^-1*(y+6)
x = 3*a^-1*(y+6)
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