(8r2-7r-9)+(-r2+r)

Remove parentheses.

8r2-7r-9-r2+r

Subtract r2 from 8r2.

7r2-7r-9+r

Add -7r and r.

7r2-6r-9

Add (8r^2-7r-9)+(-r^2+r)

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# Add (8r^2-7r-9)+(-r^2+r)

(8r2-7r-9)+(-r2+r)

Remove parentheses.

8r2-7r-9-r2+r

Subtract r2 from 8r2.

7r2-7r-9+r

Add -7r and r.

7r2-6r-9

Add (8r^2-7r-9)+(-r^2+r)