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x in (-oo:+oo)
(3/7)*x-1/6 = 47/42 // - 47/42
(3/7)*x-1/6-(47/42) = 0
(3/7)*x-1/6-47/42 = 0
3/7*x-9/7 = 0 // + 9/7
3/7*x = 9/7 // : 3/7
x = 9/7/3/7
x = 3
x = 3
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