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a in (-oo:+oo)
2/7 = a/49 // - a/49
2/7-(a/49) = 0
2/7-1/49*a = 0 // - 2/7
-1/49*a = -2/7 // : -1/49
a = -2/7/(-1/49)
a = 14
a = 14
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