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a in (-oo:+oo)
3/8 = (5/3)*a // - (5/3)*a
3/8-((5/3)*a) = 0
(-5/3)*a+3/8 = 0
3/8-5/3*a = 0 // - 3/8
-5/3*a = -3/8 // : -5/3
a = -3/8/(-5/3)
a = 9/40
a = 9/40
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