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a in (-oo:+oo)
(1/2)*a+2/5 = 39/10 // - 39/10
(1/2)*a+2/5-(39/10) = 0
(1/2)*a+2/5-39/10 = 0
1/2*a-7/2 = 0 // + 7/2
1/2*a = 7/2 // : 1/2
a = 7/2/1/2
a = 7
a = 7
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