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x in (-oo:+oo)
(-2/3)*(2*x+9) = (1/3)*(-4*x-54)+12 // - (1/3)*(-4*x-54)+12
(-2/3)*(2*x+9)-((1/3)*(-4*x-54))-12 = 0
(-2/3)*(2*x+9)+(-1/3)*(-4*x-54)-12 = 0
-2/3*(2*x+9)-1/3*(-4*x-54)-12 = 0
-2/3*(2*x+9)-1/3*(-4*x-54)-12 = 0
12-12 = 0
0 = 0
0 = 0
x belongs to the empty set
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