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a in (-oo:+oo)
5*(a+8) = 85 // - 85
5*(a+8)-85 = 0
5*(a+8)-85 = 0
5*a-45 = 0
5*a-45 = 0
5*a-45 = 0 // + 45
5*a = 45 // : 5
a = 45/5
a = 9
a = 9
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