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x in (-oo:+oo)
(5*x+9)/(-6) = (3*x+6)/(-3) // - (3*x+6)/(-3)
(5*x+9)/(-6)-((3*x+6)/(-3)) = 0
(5*x+9)/(-6)+(-1*(3*x+6))/(-3) = 0
(-3*(5*x+9))/(-6*(-3))+(-6*(-1)*(3*x+6))/(-6*(-3)) = 0
-3*(5*x+9)-6*(-1)*(3*x+6) = 0
3*x+9 = 0
(3*x+9)/(-6*(-3)) = 0
(3*x+9)/(-6*(-3)) = 0 // * -6*(-3)
3*x+9 = 0
3*x+9 = 0 // - 9
3*x = -9 // : 3
x = -9/3
x = -3
x = -3
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