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x in (-oo:+oo)
3*x-f-x+3/42 = X // - X
3*x-X-f-x+3/42 = 0
2*x-X-f+1/14 = 0 // - 1/14-X-f
2*x = -(1/14-X-f) // : 2
x = (-(1/14-X-f))/2
x = (-(1/14-X-f))/2
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