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x in (-oo:+oo)
x/0.8 = -1.9 // + 1.9
x/0.8+1.9 = 0
1.25*x+1.9 = 0 // - 1.9
1.25*x = -1.9 // : 1.25
x = -1.9/1.25
x = -1.52
x = -1.52
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