Answer:
The simplest form is 20(y - z)
Explanation:
4(5y+2z) = 20y + 8z
4(5z+2y) = 20z + 8y
4(5y+2z)+8z-4(5z+2y) = (20y + 8z) + 8z - (20z + 8y)
= 20y - 20z
= 20(y - z)
I tried to explain it and I hope it helps!
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