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a in (-oo:+oo)
a/2 = 61/2 // - 61/2
a/2-(61/2) = 0
a/2-61/2 = 0
1/2*a-61/2 = 0 // + 61/2
1/2*a = 61/2 // : 1/2
a = 61/2/1/2
a = 61
a = 61
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