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a in (-oo:+oo)
6*a+7 = (1/2)*a+39/4 // - (1/2)*a+39/4
6*a-((1/2)*a)-(39/4)+7 = 0
6*a+(-1/2)*a-39/4+7 = 0
11/2*a-11/4 = 0 // + 11/4
11/2*a = 11/4 // : 11/2
a = 11/4/11/2
a = 1/2
a = 1/2
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