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a in (-oo:+oo)
4/7 = a/161 // - a/161
4/7-(a/161) = 0
4/7-1/161*a = 0 // - 4/7
-1/161*a = -4/7 // : -1/161
a = -4/7/(-1/161)
a = 92
a = 92
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