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X in (-oo:+oo)
7*(8/6-2*X+5)-2 = 12 // - 12
7*(8/6-2*X+5)-12-2 = 0
7*(19/3-2*X)-12-2 = 0
7*(19/3-2*X)-12-2 = 0
97/3-14*X-2 = 0
91/3-14*X = 0
91/3-14*X = 0
91/3-14*X = 0 // - 91/3
-14*X = -91/3 // : -14
X = -91/3/(-14)
X = 13/6
X = 13/6
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