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X in (-oo:+oo)
5-((2/3)*X) = 7 // - 7
5-((2/3)*X)-7 = 0
(-2/3)*X-7+5 = 0
-2/3*X-2 = 0 // + 2
-2/3*X = 2 // : -2/3
X = 2/(-2/3)
X = -3
X = -3
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