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a in (-oo:+oo)
5-(5*a) = 15 // - 15
5-(5*a)-15 = 0
5-5*a-15 = 0
-5*a-10 = 0 // + 10
-5*a = 10 // : -5
a = 10/(-5)
a = -2
a = -2
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