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X in (-oo:+oo)
X/1.7+4.2 = 6.3 // - 6.3
X/1.7-6.3+4.2 = 0
0.58823529*X-2.1 = 0 // + 2.1
0.58823529*X = 2.1 // : 0.58823529
X = 2.1/0.58823529
X = 3.57000002
X = 3.57000002
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