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x in (-oo:+oo)
(1/3)*x-(2/7) = 5/7 // - 5/7
(1/3)*x-(2/7)-(5/7) = 0
(1/3)*x-2/7-5/7 = 0
1/3*x-1 = 0 // + 1
1/3*x = 1 // : 1/3
x = 1/1/3
x = 3
x = 3
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