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x in (-oo:+oo)
(6/7)*x = 6/42 // - 6/42
(6/7)*x-(6/42) = 0
(6/7)*x-1/7 = 0
6/7*x-1/7 = 0 // + 1/7
6/7*x = 1/7 // : 6/7
x = 1/7/6/7
x = 1/6
x = 1/6
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