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a in (-oo:+oo)
a-(5/2) = (3/8)*a // - (3/8)*a
a-((3/8)*a)-(5/2) = 0
a+(-3/8)*a-5/2 = 0
5/8*a-5/2 = 0 // + 5/2
5/8*a = 5/2 // : 5/8
a = 5/2/5/8
a = 4
a = 4
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