Question 1112080
Proportion is the equality of ratios.


Your two ratios:

{{{x/(2x+1)}}}

and

{{{16/40}}}



They are equal, for a proportion.


{{{x/(2x+1)=16/40}}}


You want to solve for the variable?

{{{x=(2x+1)(16/40)}}}

{{{x=(2x+1)(4/10)}}}

{{{x=(2/5)(2x+1)}}}

{{{5x=4x+2}}}

{{{highlight_green(x=2)}}}

(Could be done in fewer steps)