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a in (-oo:+oo)
(-8/15)*a = 9/10 // - 9/10
(-8/15)*a-(9/10) = 0
(-8/15)*a-9/10 = 0
-8/15*a-9/10 = 0 // + 9/10
-8/15*a = 9/10 // : -8/15
a = 9/10/(-8/15)
a = -27/16
a = -27/16
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