You need to expand the brackets on both sides and then you can break it down
A= 1,3
B= 5,5
C= 6,1
Here you go
<span>Equation:
silver + silver = silver
0.45x + 0.60(40-x) = 0.48*40
----------------
45x + 60*40 - 60x = 48*40
--------
-15x = -12*40
x = (4/5)40
x = 32 lbs (amt of 45% slloy needed)
40-x = 8 lbs (amt of 60% alloy needed)</span>
ANSWER

EXPLANATION
The given expression is

We factor to get,

This implies that,

We factor further to obtain,

or