Apply the distributive property.

Apply the distributive property.

Apply the distributive property.

Simplify each term.

Multiply by .

Move to the left of .

Multiply by .

Add and .

Multiply (r+6)(r+7)

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# Multiply (r+6)(r+7)

Apply the distributive property.

Apply the distributive property.

Apply the distributive property.

Simplify each term.

Multiply by .

Move to the left of .

Multiply by .

Add and .

Multiply (r+6)(r+7)