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a in (-oo:+oo)
(a/3)/5 = 25/2 // - 25/2
(a/3)/5-(25/2) = 0
(a/3)/5-25/2 = 0
1/15*a-25/2 = 0 // + 25/2
1/15*a = 25/2 // : 1/15
a = 25/2/1/15
a = 375/2
a = 375/2
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