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a in (-oo:+oo)
-5/2 = 5*a+a-(1/4) // - 5*a+a-(1/4)
1/4-(5*a)-a-5/2 = 0
1/4-5*a-a-5/2 = 0
-6*a-9/4 = 0 // + 9/4
-6*a = 9/4 // : -6
a = 9/4/(-6)
a = -3/8
a = -3/8
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