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a in (-oo:+oo)
3/10 = (12/25)*a // - (12/25)*a
3/10-((12/25)*a) = 0
(-12/25)*a+3/10 = 0
3/10-12/25*a = 0 // - 3/10
-12/25*a = -3/10 // : -12/25
a = -3/10/(-12/25)
a = 5/8
a = 5/8
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