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x in (-oo:+oo)
(1/3)*(4-x) = 1/2 // - 1/2
(1/3)*(4-x)-(1/2) = 0
(1/3)*(4-x)-1/2 = 0
1/3*(4-x)-1/2 = 0
(1/3*2*(4-x))/2-1/2 = 0
1/3*2*(4-x)-1 = 0
5/3-2/3*x = 0
(5/3-2/3*x)/2 = 0
(5/3-2/3*x)/2 = 0 // * 2
5/3-2/3*x = 0
5/3-2/3*x = 0 // - 5/3
-2/3*x = -5/3 // : -2/3
x = -5/3/(-2/3)
x = 5/2
x = 5/2
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