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x in (-oo:+oo)
(2/7)*x = 1/4 // - 1/4
(2/7)*x-(1/4) = 0
(2/7)*x-1/4 = 0
2/7*x-1/4 = 0 // + 1/4
2/7*x = 1/4 // : 2/7
x = 1/4/2/7
x = 7/8
x = 7/8
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