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a in (-oo:+oo)
3*a-((2/3)*a)-8 = -188/27 // + -188/27
3*a-((2/3)*a)-(-188/27)-8 = 0
3*a+(-2/3)*a+188/27-8 = 0
7/3*a-28/27 = 0 // + 28/27
7/3*a = 28/27 // : 7/3
a = 28/27/7/3
a = 4/9
a = 4/9
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