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a in (-oo:+oo)
3/5-((2/5)*a) = 0
(-2/5)*a+3/5 = 0
3/5-2/5*a = 0 // - 3/5
-2/5*a = -3/5 // : -2/5
a = -3/5/(-2/5)
a = 3/2
a = 3/2
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