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a in (-oo:+oo)
(1/2)*a-4 = 3-(1/4) // - 3-(1/4)
(1/2)*a+1/4-4-3 = 0
1/2*a-27/4 = 0 // + 27/4
1/2*a = 27/4 // : 1/2
a = 27/4/1/2
a = 27/2
a = 27/2
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