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a in (-oo:+oo)
a+(2/3)*a-6 = -58/3 // + -58/3
a+(2/3)*a-(-58/3)-6 = 0
a+(2/3)*a+58/3-6 = 0
5/3*a+40/3 = 0 // - 40/3
5/3*a = -40/3 // : 5/3
a = -40/3/5/3
a = -8
a = -8
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