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