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