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x in (-oo:+oo)
(7*x)/3 = 2/4 // - 2/4
(7*x)/3-(2/4) = 0
(7*x)/3-1/2 = 0
7/3*x-1/2 = 0 // + 1/2
7/3*x = 1/2 // : 7/3
x = 1/2/7/3
x = 3/14
x = 3/14
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