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a in (-oo:+oo)
2*a-(5*a)-5 = -14 // + 14
2*a-(5*a)-5+14 = 0
2*a-5*a-5+14 = 0
9-3*a = 0 // - 9
-3*a = -9 // : -3
a = -9/(-3)
a = 3
a = 3
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