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x in (-oo:+oo)
(4/7)*x = 3/14 // - 3/14
(4/7)*x-(3/14) = 0
(4/7)*x-3/14 = 0
4/7*x-3/14 = 0 // + 3/14
4/7*x = 3/14 // : 4/7
x = 3/14/4/7
x = 3/8
x = 3/8
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