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