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1 Answer

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13d-(9d-4)=4d+4
STEPS
13d-(d-4)
Distribute Parentheses
=-(9d)-(-4)
Apply Minus-Plus Rules
-(-a)=a.  -(a)=-a
=-9d+4
=13d-9d+4
Add Similar Elements: 13d-9d=4d
Answer= 4d+4

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