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a in (-oo:+oo)
4*a+5 = 113-5*a // - 113-5*a
4*a-(-5*a)-113+5 = 0
4*a+5*a-113+5 = 0
9*a-108 = 0 // + 108
9*a = 108 // : 9
a = 108/9
a = 12
a = 12
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