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a in (-oo:+oo)
(-1/4)*a = 2/5 // - 2/5
(-1/4)*a-(2/5) = 0
(-1/4)*a-2/5 = 0
-1/4*a-2/5 = 0 // + 2/5
-1/4*a = 2/5 // : -1/4
a = 2/5/(-1/4)
a = -8/5
a = -8/5
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