Question 469537
.5[5x = 2x] = 1.25x  You must mean [5x + 2x] ??
.5[7x] = 1.25x 
3.5x = 1.25x
Now what? or what did I do wrong? 
You did nothing wrong.
3.5x = 1.25x
14x = 5x
9x = 0
x = 0