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x in (-oo:+oo)
x/0.16 = 0.75/0.4 // - 0.75/0.4
x/0.16-(0.75/0.4) = 0
x/0.16-1.875 = 0
6.25*x-1.875 = 0 // + 1.875
6.25*x = 1.875 // : 6.25
x = 1.875/6.25
x = 0.3
x = 0.3
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