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x in (-oo:+oo)
(3*x-(9*x))/6 = 8 // - 8
(3*x-(9*x))/6-8 = 0
(3*x-9*x)/6-8 = 0
(-6*x)/6-8 = 0
(-6*x)/6+(-8*6)/6 = 0
-6*x-8*6 = 0
-6*x-48 = 0
(-6*x-48)/6 = 0
(-6*x-48)/6 = 0 // * 6
-6*x-48 = 0
-6*x-48 = 0 // + 48
-6*x = 48 // : -6
x = 48/(-6)
x = -8
x = -8
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