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z in (-oo:+oo)
5*(1/5)*z = -3.8*(1/5) // + -3.8*(1/5)
5*(1/5)*z-(-3.8*(1/5)) = 0
5*(1/5)*z+0.76 = 0
z+0.76 = 0 // - 0.76
z = -0.76
z = -0.76
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