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a in (-oo:+oo)
5*a+1/4 = 3*a-9 // - 3*a-9
5*a-(3*a)+1/4+9 = 0
5*a-3*a+1/4+9 = 0
2*a+37/4 = 0 // - 37/4
2*a = -37/4 // : 2
a = -37/4/2
a = -37/8
a = -37/8
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