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a in (-oo:+oo)
6*a+(1/2)*a-(1/4) = 25/4 // - 25/4
6*a+(1/2)*a-(1/4)-(25/4) = 0
6*a+(1/2)*a-1/4-25/4 = 0
13/2*a-13/2 = 0 // + 13/2
13/2*a = 13/2 // : 13/2
a = 13/2/13/2
a = 1
a = 1
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