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x in (-oo:+oo)
X-(6/42) = 2*x-(14/77) // - 2*x-(14/77)
X-(2*x)-(6/42)+14/77 = 0
X-2*x-1/7+14/77 = 0
X-2*x+3/77 = 0 // - X+3/77
-2*x = -(X+3/77) // : -2
x = (-(X+3/77))/(-2)
x = (X+3/77)/2
x = (X+3/77)/2
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