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a in (-oo:+oo)
2-7*a = 47/6 // - 47/6
2-7*a-(47/6) = 0
2-7*a-47/6 = 0
-7*a-35/6 = 0 // + 35/6
-7*a = 35/6 // : -7
a = 35/6/(-7)
a = -5/6
a = -5/6
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