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x in (-oo:+oo)
(3*x)/7 = 1/2 // - 1/2
(3*x)/7-(1/2) = 0
(3*x)/7-1/2 = 0
3/7*x-1/2 = 0 // + 1/2
3/7*x = 1/2 // : 3/7
x = 1/2/3/7
x = 7/6
x = 7/6
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