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x in (-oo:+oo)
X/3 = x-(31/2) // - x-(31/2)
X/3-x+31/2 = 0
1/3*X-x+31/2 = 0 // - 1/3*X+31/2
-x = -(1/3*X+31/2) // * -1
x = 1/3*X+31/2
x = 1/3*X+31/2
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