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a in (-oo:+oo)
(1/2)*a+5*a+3 = 14 // - 14
(1/2)*a+5*a-14+3 = 0
11/2*a-11 = 0 // + 11
11/2*a = 11 // : 11/2
a = 11/11/2
a = 2
a = 2
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