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a in (-oo:+oo)
a+1/2 = 61/2-a // - 61/2-a
a+a+1/2-(61/2) = 0
a+a+1/2-61/2 = 0
2*a-30 = 0 // + 30
2*a = 30 // : 2
a = 30/2
a = 15
a = 15
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