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a in (-oo:+oo)
-(5*a)-5 = (-2/5)*a-(47/60) // - (-2/5)*a-(47/60)
47/60-(5*a)-((-2/5)*a)-5 = 0
(2/5)*a-5*a+47/60-5 = 0
-23/5*a-253/60 = 0 // + 253/60
-23/5*a = 253/60 // : -23/5
a = 253/60/(-23/5)
a = -11/12
a = -11/12
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