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a in (-oo:+oo)
(5/6)*a-2.5 = 18 // - 18
(5/6)*a-18-2.5 = 0
5/6*a-20.5 = 0 // + 20.5
5/6*a = 20.5 // : 5/6
a = 20.5/5/6
a = 24.6000001
a = 24.6000001
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