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