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a in (-oo:+oo)
5/7 = a/49 // - a/49
5/7-(a/49) = 0
5/7-1/49*a = 0 // - 5/7
-1/49*a = -5/7 // : -1/49
a = -5/7/(-1/49)
a = 35
a = 35
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