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x in (-oo:+oo)
x/0.45-2.5 = -3 // + 3
x/0.45-2.5+3 = 0
2.22222222*x+0.5 = 0 // - 0.5
2.22222222*x = -0.5 // : 2.22222222
x = -0.5/2.22222222
x = -0.225
x = -0.225
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