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a in (-oo:+oo)
a/15 = 45/15 // - 45/15
a/15-(45/15) = 0
a/15-3 = 0
1/15*a-3 = 0 // + 3
1/15*a = 3 // : 1/15
a = 3/1/15
a = 45
a = 45
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