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a in (-oo:+oo)
5*a-(5/(-10)) = -34.5 // + 34.5
5*a-(5/(-10))+34.5 = 0
5*a+1/2+34.5 = 0
5*a+35 = 0 // - 35
5*a = -35 // : 5
a = -35/5
a = -7
a = -7
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