Evaluate the Summation sum from k=3 to 6 of -5k+20

Math
Expand the series for each value of .
Simplify.
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Simplify each term.
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Multiply by .
Multiply by .
Multiply by .
Multiply by .
Simplify by adding and subtracting.
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Add and .
Subtract from .
Add and .
Subtract from .
Add and .
Subtract from .
Add and .
Evaluate the Summation sum from k=3 to 6 of -5k+20

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