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a in (-oo:+oo)
(6*a)/4-2 = 8 // - 8
(6*a)/4-8-2 = 0
3/2*a-10 = 0 // + 10
3/2*a = 10 // : 3/2
a = 10/3/2
a = 20/3
a = 20/3
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