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a in (-oo:+oo)
14/3 = a/15 // - a/15
14/3-(a/15) = 0
14/3-1/15*a = 0 // - 14/3
-1/15*a = -14/3 // : -1/15
a = -14/3/(-1/15)
a = 70
a = 70
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