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a in (-oo:+oo)
5*(10-2*a) = -10 // + 10
5*(10-2*a)+10 = 0
5*(10-2*a)+10 = 0
60-10*a = 0
60-10*a = 0
60-10*a = 0 // - 60
-10*a = -60 // : -10
a = -60/(-10)
a = 6
a = 6
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