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a in (-oo:+oo)
(15/4)*a = 21/8 // - 21/8
(15/4)*a-(21/8) = 0
(15/4)*a-21/8 = 0
15/4*a-21/8 = 0 // + 21/8
15/4*a = 21/8 // : 15/4
a = 21/8/15/4
a = 7/10
a = 7/10
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