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x in (-oo:+oo)
x/(-3) = 6-3 // - 6-3
x/(-3)-6+3 = 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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