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a in (-oo:+oo)
a/6 = 15/2 // - 15/2
a/6-(15/2) = 0
a/6-15/2 = 0
1/6*a-15/2 = 0 // + 15/2
1/6*a = 15/2 // : 1/6
a = 15/2/1/6
a = 45
a = 45
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