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a in (-oo:+oo)
6*a+2/3 = 218/3 // - 218/3
6*a+2/3-(218/3) = 0
6*a+2/3-218/3 = 0
6*a-72 = 0 // + 72
6*a = 72 // : 6
a = 72/6
a = 12
a = 12
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