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x in (-oo:+oo)
(2/7)*x-7 = 9/7 // - 9/7
(2/7)*x-(9/7)-7 = 0
(2/7)*x-9/7-7 = 0
2/7*x-58/7 = 0 // + 58/7
2/7*x = 58/7 // : 2/7
x = 58/7/2/7
x = 29
x = 29
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