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a in (-oo:+oo)
a-8 = (5*a)/3+6 // - (5*a)/3+6
a-((5*a)/3)-8-6 = 0
a+(-5/3)*a-8-6 = 0
-2/3*a-14 = 0 // + 14
-2/3*a = 14 // : -2/3
a = 14/(-2/3)
a = -21
a = -21
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