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x in (-oo:+oo)
x/14-(1/4) = x+3/7 // - x+3/7
x/14-x-(1/4)-(3/7) = 0
x/14-x-1/4-3/7 = 0
-13/14*x-19/28 = 0 // + 19/28
-13/14*x = 19/28 // : -13/14
x = 19/28/(-13/14)
x = -19/26
x = -19/26
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