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X in (-oo:+oo)
X/2-2.1 = -14.9 // + 14.9
X/2-2.1+14.9 = 0
1/2*X+12.8 = 0 // - 12.8
1/2*X = -12.8 // : 1/2
X = -12.8/1/2
X = -25.6
X = -25.6
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