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a in (-oo:+oo)
(7/1)/2 = a+10/2 // - a+10/2
(7/1)/2-a-(10/2) = 0
7/2-a-5 = 0
-a-3/2 = 0 // + 3/2
-a = 3/2 // * -1
a = -3/2
a = -3/2
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