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x in (-oo:+oo)
((4/3)*x+(4/3)*x-1)/3+1 = 6 // - 6
((4/3)*x+(4/3)*x-1)/3-6+1 = 0
(8/3*x-1)/3-6+1 = 0
(8/3*x-1)/3+(-6*3)/3+(1*3)/3 = 0
8/3*x-6*3+1*3-1 = 0
8/3*x-19+3 = 0
8/3*x-16 = 0
(8/3*x-16)/3 = 0
(8/3*x-16)/3 = 0 // * 3
8/3*x-16 = 0
8/3*x-16 = 0 // + 16
8/3*x = 16 // : 8/3
x = 16/8/3
x = 6
x = 6
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