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a in (-oo:+oo)
a/10 = 1/2 // - 1/2
a/10-(1/2) = 0
a/10-1/2 = 0
1/10*a-1/2 = 0 // + 1/2
1/10*a = 1/2 // : 1/10
a = 1/2/1/10
a = 5
a = 5
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