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a in (-oo:+oo)
3*a+2 = 7*a+14 // - 7*a+14
3*a-(7*a)-14+2 = 0
3*a-7*a-14+2 = 0
-4*a-12 = 0 // + 12
-4*a = 12 // : -4
a = 12/(-4)
a = -3
a = -3
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