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x in (-oo:+oo)
M = (1/3)*x-6 // - (1/3)*x-6
M-((1/3)*x)+6 = 0
M+(-1/3)*x+6 = 0
M-1/3*x+6 = 0 // - M+6
-1/3*x = -(M+6) // : -1/3
x = (-(M+6))/(-1/3)
x = 3*(M+6)
x = 3*(M+6)
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