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a in (-oo:+oo)
10-6*a-(5*a) = -89 // + 89
10-6*a-(5*a)+89 = 0
10-6*a-5*a+89 = 0
99-11*a = 0 // - 99
-11*a = -99 // : -11
a = -99/(-11)
a = 9
a = 9
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