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x in (-oo:+oo)
(3/7)*x = 20/7-x // - 20/7-x
(3/7)*x+x-(20/7) = 0
(3/7)*x+x-20/7 = 0
10/7*x-20/7 = 0 // + 20/7
10/7*x = 20/7 // : 10/7
x = 20/7/10/7
x = 2
x = 2
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