x+x/2+x/4=28 4x+2x+x=112 7x=112 x=112/7=16 Coroana?

x+[latex] frac{x}{2} [/latex]+[latex] frac{x}{4} [/latex]=28 ( aducem la acelasi numitor ) => [latex] frac{4x}{4} [/latex]+[latex] frac{2x}{4} [/latex]+[latex] frac{x}{4} [/latex]=28     [latex] frac{4x+2x+x}{4} [/latex]=28 (inmultim cu patru) => 7x=112 ; x= [latex] frac{112}{7} [/latex] ; x=16