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x in (-oo:+oo)
(1/4)*x = 3/7 // - 3/7
(1/4)*x-(3/7) = 0
(1/4)*x-3/7 = 0
1/4*x-3/7 = 0 // + 3/7
1/4*x = 3/7 // : 1/4
x = 3/7/1/4
x = 12/7
x = 12/7
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