[tex]\it Fie\ \ x\ -\ pre\c{\it t}ul\ ini\c{\it t}ial.[/tex]
[tex]\it x+\dfrac{20}{100}x=243|_{\cdot100} \Rightarrow 100x+20x=24300 \Rightarrow 120x=24300|_{:10} \Rightarrow \\ \\ \\ \Rightarrow 12x=2430|_{:6} \Rightarrow 2x=405|_{:2} \Rightarrow x=202,50 \ell ei[/tex]
