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x in (-oo:+oo)
X/3 = x-(4/7) // - x-(4/7)
X/3-x+4/7 = 0
1/3*X-x+4/7 = 0 // - 1/3*X+4/7
-x = -(1/3*X+4/7) // * -1
x = 1/3*X+4/7
x = 1/3*X+4/7
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