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