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a in (-oo:+oo)
(1/2)*(4*a-16) = 6 // - 6
(1/2)*(4*a-16)-6 = 0
1/2*(4*a-16)-6 = 0
1/2*(4*a-16)-6 = 0
2*a-14 = 0
2*a-14 = 0
2*a-14 = 0 // + 14
2*a = 14 // : 2
a = 14/2
a = 7
a = 7
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