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a in (-oo:+oo)
-1 = 5*a-(3*a)-5 // - 5*a-(3*a)-5
3*a-(5*a)-1+5 = 0
3*a-5*a-1+5 = 0
4-2*a = 0 // - 4
-2*a = -4 // : -2
a = -4/(-2)
a = 2
a = 2
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