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a in (-oo:+oo)
(5/8)*(a-2) = 10 // - 10
(5/8)*(a-2)-10 = 0
5/8*(a-2)-10 = 0
5/8*(a-2)-10 = 0
5/8*a-45/4 = 0
5/8*a-45/4 = 0
5/8*a-45/4 = 0 // + 45/4
5/8*a = 45/4 // : 5/8
a = 45/4/5/8
a = 18
a = 18
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