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a in (-oo:+oo)
a/15 = 52/12 // - 52/12
a/15-(52/12) = 0
a/15-13/3 = 0
1/15*a-13/3 = 0 // + 13/3
1/15*a = 13/3 // : 1/15
a = 13/3/1/15
a = 65
a = 65
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