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a in (-oo:+oo)
39/14 = a/7 // - a/7
39/14-(a/7) = 0
39/14-1/7*a = 0 // - 39/14
-1/7*a = -39/14 // : -1/7
a = -39/14/(-1/7)
a = 39/2
a = 39/2
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