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x in (-oo:+oo)
4/3.8 = x/y // - x/y
4/3.8-(x/y) = 0
x*(-y^-1)+1.05263158 = 0 // - 1.05263158
x*(-y^-1) = -1.05263158 // : -y^-1
x = -1.05263158/(-y^-1)
x = 1.05263158/(y^-1)
x = 1.05263158/(y^-1)
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