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a in (-oo:+oo)
0.24 = a/0.2 // - a/0.2
0.24-(a/0.2) = 0
0.24-5*a = 0
0.24-5*a = 0 // - 0.24
-5*a = -0.24 // : -5
a = -0.24/(-5)
a = 0.048
a = 0.048
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