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x in (-oo:+oo)
4.5 = 1.4-(x/0.8) // - 1.4-(x/0.8)
x/0.8-1.4+4.5 = 0
1.25*x+3.1 = 0 // - 3.1
1.25*x = -3.1 // : 1.25
x = -3.1/1.25
x = -2.48
x = -2.48
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