5 (4x - 2) = 20x - 10
20x - 10 = 14x + 8
[20 - 14]x [-10 + 10] = [14 - 14]x + [8 + 10]
6x = 18
x = 3
Es 10000
25% = 1/4
1/4(200) = 50
200-50 = 150
it will be $150 on sale
So far, yes.
+1006 
