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x in (-oo:+oo)
(3/7)*x-(2/5) = 2 // - 2
(3/7)*x-(2/5)-2 = 0
(3/7)*x-2/5-2 = 0
3/7*x-12/5 = 0 // + 12/5
3/7*x = 12/5 // : 3/7
x = 12/5/3/7
x = 28/5
x = 28/5
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