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a in (-oo:+oo)
a/0.4 = 40/100 // - 40/100
a/0.4-(40/100) = 0
a/0.4-2/5 = 0
2.5*a-2/5 = 0 // + 2/5
2.5*a = 2/5 // : 2.5
a = 2/5/2.5
a = 0.16
a = 0.16
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