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a in (-oo:+oo)
a/4 = a/5+1/2 // - a/5+1/2
a/4-(a/5)-(1/2) = 0
a/4-(a/5)-1/2 = 0
1/20*a-1/2 = 0 // + 1/2
1/20*a = 1/2 // : 1/20
a = 1/2/1/20
a = 10
a = 10
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