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a in (-oo:+oo)
7-(2*a) = 63/11 // - 63/11
7-(2*a)-(63/11) = 0
7-2*a-63/11 = 0
14/11-2*a = 0 // - 14/11
-2*a = -14/11 // : -2
a = -14/11/(-2)
a = 7/11
a = 7/11
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