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a in (-oo:+oo)
a/2 = 10/4 // - 10/4
a/2-(10/4) = 0
a/2-5/2 = 0
1/2*a-5/2 = 0 // + 5/2
1/2*a = 5/2 // : 1/2
a = 5/2/1/2
a = 5
a = 5
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