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