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x in (-oo:+oo)
(3*x)/7-1 = x/3 // - x/3
(3*x)/7-(x/3)-1 = 0
2/21*x-1 = 0 // + 1
2/21*x = 1 // : 2/21
x = 1/2/21
x = 21/2
x = 21/2
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