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a in (-oo:+oo)
60 = a/1-0.4 // - a/1-0.4
0.4-(a/1)+60 = 0
0.4-a+60 = 0
60.4-a = 0 // - 60.4
-a = -60.4 // * -1
a = 60.4
a = 60.4
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