Simplify the following:
5 x-3 (2 x-4 y)-5 (3 x+4 y)
-3 (2 x-4 y) = 12 y-6 x:
5 x+12 y-6 x-5 (3 x+4 y)
-5 (3 x+4 y) = -15 x-20 y:
5 x-6 x+12 y+-15 x-20 y
Grouping like terms, 5 x-6 x+12 y-15 x-20 y = (12 y-20 y)+(5 x-6 x-15 x):
(12 y-20 y)+(5 x-6 x-15 x)
12 y-20 y = -8 y:
-8 y+(5 x-6 x-15 x)
5 x-6 x-15 x = -16 x:
-16 x-8 y
Factor 8 out of -8 y-16 x:
Answer: | 8 (-y - 2x)
