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a in (-oo:+oo)
(5/8)*(a-8) = 10 // - 10
(5/8)*(a-8)-10 = 0
5/8*(a-8)-10 = 0
5/8*(a-8)-10 = 0
5/8*a-15 = 0
5/8*a-15 = 0
5/8*a-15 = 0 // + 15
5/8*a = 15 // : 5/8
a = 15/5/8
a = 24
a = 24
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