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a in (-oo:+oo)
(1/3)*a-(1/2) = 81/2 // - 81/2
(1/3)*a-(1/2)-(81/2) = 0
(1/3)*a-1/2-81/2 = 0
1/3*a-41 = 0 // + 41
1/3*a = 41 // : 1/3
a = 41/1/3
a = 123
a = 123
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