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X in (-oo:+oo)
-7*(X/3) = 9 // - 9
-7*(X/3)-9 = 0
-7/3*X-9 = 0 // + 9
-7/3*X = 9 // : -7/3
X = 9/(-7/3)
X = -27/7
X = -27/7
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