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x in (-oo:+oo)
x-(2/7) = 2*x+2/28 // - 2*x+2/28
x-(2*x)-(2/7)-(2/28) = 0
x-2*x-2/7-1/14 = 0
-x-5/14 = 0 // + 5/14
-x = 5/14 // * -1
x = -5/14
x = -5/14
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