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x in (-oo:+oo)
x/4.6 = -2.5 // + 2.5
x/4.6+2.5 = 0
0.2173913*x+2.5 = 0 // - 2.5
0.2173913*x = -2.5 // : 0.2173913
x = -2.5/0.2173913
x = -11.50000023
x = -11.50000023
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