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a in (-oo:+oo)
-9*a-(8/8)-15 = 5 // - 5
-9*a-(8/8)-15-5 = 0
-9*a-15-5-1 = 0
-9*a-21 = 0 // + 21
-9*a = 21 // : -9
a = 21/(-9)
a = -7/3
a = -7/3
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