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x in (-oo:+oo)
(2/3)*(x+9) = (1/3)*(x+6) // - (1/3)*(x+6)
(2/3)*(x+9)-((1/3)*(x+6)) = 0
(2/3)*(x+9)+(-1/3)*(x+6) = 0
2/3*(x+9)-1/3*(x+6) = 0
2/3*(x+9)-1/3*(x+6) = 0
1/3*x+4 = 0
1/3*x+4 = 0
1/3*x+4 = 0 // - 4
1/3*x = -4 // : 1/3
x = -4/1/3
x = -12
x = -12
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