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