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X in (-oo:+oo)
X/2.25 = 4 // - 4
X/2.25-4 = 0
0.44444444*X-4 = 0 // + 4
0.44444444*X = 4 // : 0.44444444
X = 4/0.44444444
X = 9.00000009
X = 9.00000009
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