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X in (-oo:+oo)
(-2/3)*X+5 = -12 // + 12
(-2/3)*X+5+12 = 0
17-2/3*X = 0 // - 17
-2/3*X = -17 // : -2/3
X = -17/(-2/3)
X = 51/2
X = 51/2
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