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a in (-oo:+oo)
2*a-(5*a)-2 = -14 // + 14
2*a-(5*a)-2+14 = 0
2*a-5*a-2+14 = 0
12-3*a = 0 // - 12
-3*a = -12 // : -3
a = -12/(-3)
a = 4
a = 4
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