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a in (-oo:+oo)
(1/2)*a+11/2 = 10 // - 10
(1/2)*a+11/2-10 = 0
1/2*a-9/2 = 0 // + 9/2
1/2*a = 9/2 // : 1/2
a = 9/2/1/2
a = 9
a = 9
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