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a in (-oo:+oo)
(1/5)*a = 1/2 // - 1/2
(1/5)*a-(1/2) = 0
(1/5)*a-1/2 = 0
1/5*a-1/2 = 0 // + 1/2
1/5*a = 1/2 // : 1/5
a = 1/2/1/5
a = 5/2
a = 5/2
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