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a in (-oo:+oo)
a/6 = 3*a-51 // - 3*a-51
a/6-(3*a)+51 = 0
a/6-3*a+51 = 0
51-17/6*a = 0 // - 51
-17/6*a = -51 // : -17/6
a = -51/(-17/6)
a = 18
a = 18
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