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x in (-oo:+oo)
(1/3)*(3*x+1) = 1/2 // - 1/2
(1/3)*(3*x+1)-(1/2) = 0
(1/3)*(3*x+1)-1/2 = 0
1/3*(3*x+1)-1/2 = 0
(1/3*2*(3*x+1))/2-1/2 = 0
1/3*2*(3*x+1)-1 = 0
2*x-1/3 = 0
(2*x-1/3)/2 = 0
(2*x-1/3)/2 = 0 // * 2
2*x-1/3 = 0
2*x-1/3 = 0 // + 1/3
2*x = 1/3 // : 2
x = 1/3/2
x = 1/6
x = 1/6
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