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a in (-oo:+oo)
10-(2*a) = a-14 // - a-14
10-(2*a)-a+14 = 0
10-2*a-a+14 = 0
24-3*a = 0 // - 24
-3*a = -24 // : -3
a = -24/(-3)
a = 8
a = 8
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