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a in (-oo:+oo)
(5/6)*a+3/8 = 83/8 // - 83/8
(5/6)*a+3/8-(83/8) = 0
(5/6)*a+3/8-83/8 = 0
5/6*a-10 = 0 // + 10
5/6*a = 10 // : 5/6
a = 10/5/6
a = 12
a = 12
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