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a in (-oo:+oo)
5*a-2 = 7*a-14 // - 7*a-14
5*a-(7*a)-2+14 = 0
5*a-7*a-2+14 = 0
12-2*a = 0 // - 12
-2*a = -12 // : -2
a = -12/(-2)
a = 6
a = 6
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