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x in (-oo:+oo)
(3/7)*x-(2/5) = 11 // - 11
(3/7)*x-(2/5)-11 = 0
(3/7)*x-2/5-11 = 0
3/7*x-57/5 = 0 // + 57/5
3/7*x = 57/5 // : 3/7
x = 57/5/3/7
x = 133/5
x = 133/5
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