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a in (-oo:+oo)
6*a-2/3 = -11/3 // + -11/3
6*a-2/3-(-11/3) = 0
6*a-2/3+11/3 = 0
6*a+3 = 0 // - 3
6*a = -3 // : 6
a = -3/6
a = -1/2
a = -1/2
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