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x in (-oo:+oo)
(3/6)*x = 4/12 // - 4/12
(3/6)*x-(4/12) = 0
(3/6)*x-1/3 = 0
1/2*x-1/3 = 0 // + 1/3
1/2*x = 1/3 // : 1/2
x = 1/3/1/2
x = 2/3
x = 2/3
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