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x in (-oo:+oo)
0.20122 = 4*(x/250) // - 4*(x/250)
0.20122-(4*(x/250)) = 0
(-2/125)*x+0.20122 = 0
0.20122-2/125*x = 0 // - 0.20122
-2/125*x = -0.20122 // : -2/125
x = -0.20122/(-2/125)
x = 12.57625
x = 12.57625
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