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x in (-oo:+oo)
(6/7)*x = 18/49 // - 18/49
(6/7)*x-(18/49) = 0
(6/7)*x-18/49 = 0
6/7*x-18/49 = 0 // + 18/49
6/7*x = 18/49 // : 6/7
x = 18/49/6/7
x = 3/7
x = 3/7
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