[latex]\frac{5}{2x+5}=\frac{0,5}{0,9}[/latex]

2x+5=(5*0.9):0.5 2x+5=9 2x=4 x=2

[latex]\frac{5}{2x+5}=\frac{0,5}{0,9}\\ 5*0.9=0.5*(2x+5)\\ 4.5=x+2.5\\ x=4.5-2.5\\ x=2[/latex]