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a in (-oo:+oo)
a/(-6) = -4/7 // + -4/7
a/(-6)-(-4/7) = 0
a/(-6)+4/7 = 0
4/7-1/6*a = 0 // - 4/7
-1/6*a = -4/7 // : -1/6
a = -4/7/(-1/6)
a = 24/7
a = 24/7
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