Question 1112080

Hi,I'm learning proportions and I believe I have the hang of it , but I'm not sure so can you help me with this question: x over 2x+1 and 16 over 40     
                      ( the word over indicates that it's a fraction)
<pre>If it's {{{matrix(1,3, x/(2x + 1), "=", 16/40)}}}, we first of all REDUCE the fraction on the right side, to: 
{{{matrix(1,3, x/(2x + 1), "=", 2/5)}}}
5x = 2(2x + 1) ------- Cross-multiplying
5x = 4x + 2
5x - 4x = 2
{{{highlight_green(matrix(1,3, x, "=", 2))}}}