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x in (-oo:+oo)
(2/3)*(3*x-9) = (3/4)*(4*x+8) // - (3/4)*(4*x+8)
(2/3)*(3*x-9)-((3/4)*(4*x+8)) = 0
(2/3)*(3*x-9)+(-3/4)*(4*x+8) = 0
2/3*(3*x-9)-3/4*(4*x+8) = 0
2/3*(3*x-9)-3/4*(4*x+8) = 0
-x-12 = 0
-x-12 = 0
-x-12 = 0 // + 12
-x = 12 // * -1
x = -12
x = -12
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