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a in (-oo:+oo)
(1/2)*a+7 = 71/10 // - 71/10
(1/2)*a-(71/10)+7 = 0
(1/2)*a-71/10+7 = 0
1/2*a-1/10 = 0 // + 1/10
1/2*a = 1/10 // : 1/2
a = 1/10/1/2
a = 1/5
a = 1/5
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