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x in (-oo:+oo)
(2/3)*(x-4) = 1/3 // - 1/3
(2/3)*(x-4)-(1/3) = 0
(2/3)*(x-4)-1/3 = 0
2/3*(x-4)-1/3 = 0
(2/3*3*(x-4))/3-1/3 = 0
2/3*3*(x-4)-1 = 0
2*x-9 = 0
(2*x-9)/3 = 0
(2*x-9)/3 = 0 // * 3
2*x-9 = 0
2*x-9 = 0 // + 9
2*x = 9 // : 2
x = 9/2
x = 9/2
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