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a in (-oo:+oo)
(5/(-14))*a = -10 // + 10
(5/(-14))*a+10 = 0
10-5/14*a = 0 // - 10
-5/14*a = -10 // : -5/14
a = -10/(-5/14)
a = 28
a = 28
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