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Perform the indicated operations & simplify, give your answer in standard form.
Add: `(20 -2 i) + (7 + 8 i)`
sum =
Subtract: `(20 -2 i) - (7 + 8 i)`
difference =
Add: `(20 -2 i) + (7 + 8 i)`
sum =
Subtract: `(20 -2 i) - (7 + 8 i)`
difference =