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a in (-oo:+oo)
2/3-(12*a)+15 = 14 // - 14
2/3-(12*a)-14+15 = 0
2/3-12*a-14+15 = 0
5/3-12*a = 0 // - 5/3
-12*a = -5/3 // : -12
a = -5/3/(-12)
a = 5/36
a = 5/36
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