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a in (-oo:+oo)
-(5*a)-(4*a)-1 = 26 // - 26
-(5*a)-(4*a)-26-1 = 0
-5*a-4*a-26-1 = 0
-9*a-27 = 0 // + 27
-9*a = 27 // : -9
a = 27/(-9)
a = -3
a = -3
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