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a in (-oo:+oo)
-6 = a/5+9 // - a/5+9
-(a/5)-9-6 = 0
-1/5*a-15 = 0 // + 15
-1/5*a = 15 // : -1/5
a = 15/(-1/5)
a = -75
a = -75
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