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a in (-oo:+oo)
a/2 = 61/4 // - 61/4
a/2-(61/4) = 0
a/2-61/4 = 0
1/2*a-61/4 = 0 // + 61/4
1/2*a = 61/4 // : 1/2
a = 61/4/1/2
a = 61/2
a = 61/2
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