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a in (-oo:+oo)
(5*a-4)/3 = a+6 // - a+6
(5*a-4)/3-a-6 = 0
(5*a-4)/3+(3*(-a))/3+(-6*3)/3 = 0
5*a+3*(-a)-6*3-4 = 0
2*a-18-4 = 0
2*a-22 = 0
(2*a-22)/3 = 0
(2*a-22)/3 = 0 // * 3
2*a-22 = 0
2*a-22 = 0 // + 22
2*a = 22 // : 2
a = 22/2
a = 11
a = 11
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