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a in (-oo:+oo)
2*a+6 = 25/4 // - 25/4
2*a-(25/4)+6 = 0
2*a-25/4+6 = 0
2*a-1/4 = 0 // + 1/4
2*a = 1/4 // : 2
a = 1/4/2
a = 1/8
a = 1/8
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