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x in (-oo:+oo)
(7/28)*x = 2/28 // - 2/28
(7/28)*x-(2/28) = 0
(7/28)*x-1/14 = 0
1/4*x-1/14 = 0 // + 1/14
1/4*x = 1/14 // : 1/4
x = 1/14/1/4
x = 2/7
x = 2/7
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