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x in (-oo:+oo)
x/4.1 = -1.2*k // + -1.2*k
x/4.1-(-1.2*k) = 0
1.2*k+x/4.1 = 0
1.2*k+0.24390244*x = 0 // - 1.2*k
0.24390244*x = -(1.2*k) // : 0.24390244
x = (-(1.2*k))/0.24390244
x = -4.91999998*k
x = -4.91999998*k
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