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a in (-oo:+oo)
2*a-2 = 5*a-(1/4) // - 5*a-(1/4)
2*a-(5*a)+1/4-2 = 0
2*a-5*a+1/4-2 = 0
-3*a-7/4 = 0 // + 7/4
-3*a = 7/4 // : -3
a = 7/4/(-3)
a = -7/12
a = -7/12
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