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x in (-oo:+oo)
x+6.8 = 12/19 // - 12/19
x-(12/19)+6.8 = 0
x-12/19+6.8 = 0
x+6.16842105 = 0 // - 6.16842105
x = -6.16842105
x = -6.16842105
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