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x in (-oo:+oo)
(1/3)*(x-3) = (3/4)*(x+6) // - (3/4)*(x+6)
(1/3)*(x-3)-((3/4)*(x+6)) = 0
(1/3)*(x-3)+(-3/4)*(x+6) = 0
1/3*(x-3)-3/4*(x+6) = 0
1/3*(x-3)-3/4*(x+6) = 0
-5/12*x-11/2 = 0
-5/12*x-11/2 = 0
-5/12*x-11/2 = 0 // + 11/2
-5/12*x = 11/2 // : -5/12
x = 11/2/(-5/12)
x = -66/5
x = -66/5
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