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x in (-oo:+oo)
(1/12)*x = 1/6-(5/14) // - 1/6-(5/14)
(1/12)*x-(1/6)+5/14 = 0
(1/12)*x-1/6+5/14 = 0
1/12*x+4/21 = 0 // - 4/21
1/12*x = -4/21 // : 1/12
x = -4/21/1/12
x = -16/7
x = -16/7
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