Solve for d
d=0
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-8d+4=4
Swap sides so that all variable terms are on the left hand side.
-8d=4-4
Subtract 4 from both sides.
-8d=0
Subtract 4 from 4 to get 0.
d=0
Product of two numbers is equal to 0 if at least one of them is 0. Since -8 is not equal to 0, d must be equal to 0.
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Limits
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