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a in (-oo:+oo)
(1/2)*a = 41/2 // - 41/2
(1/2)*a-(41/2) = 0
(1/2)*a-41/2 = 0
1/2*a-41/2 = 0 // + 41/2
1/2*a = 41/2 // : 1/2
a = 41/2/1/2
a = 41
a = 41
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