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a in (-oo:+oo)
a/6 = -2/7 // + -2/7
a/6-(-2/7) = 0
a/6+2/7 = 0
1/6*a+2/7 = 0 // - 2/7
1/6*a = -2/7 // : 1/6
a = -2/7/1/6
a = -12/7
a = -12/7
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