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x in (-oo:+oo)
(2/7)*x = 3/5 // - 3/5
(2/7)*x-(3/5) = 0
(2/7)*x-3/5 = 0
2/7*x-3/5 = 0 // + 3/5
2/7*x = 3/5 // : 2/7
x = 3/5/2/7
x = 21/10
x = 21/10
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