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x in (-oo:+oo)
9.2 = x/1.25-x // - x/1.25-x
x-(x/1.25)+9.2 = 0
x-0.8*x+9.2 = 0
0.2*x+9.2 = 0 // - 9.2
0.2*x = -9.2 // : 0.2
x = -9.2/0.2
x = -46
x = -46
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