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