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x in (-oo:+oo)
(1/14)*x+3 = x // - x
(1/14)*x-x+3 = 0
3-13/14*x = 0 // - 3
-13/14*x = -3 // : -13/14
x = -3/(-13/14)
x = 42/13
x = 42/13
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