(2y2-5y+3)+(y2-2y-5)

Remove parentheses.

2y2-5y+3+y2-2y-5

Add 2y2 and y2.

3y2-5y+3-2y-5

Subtract 2y from -5y.

3y2-7y+3-5

Subtract 5 from 3.

3y2-7y-2

Add (2y^2-5y+3)+(y^2-2y-5)

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# Add (2y^2-5y+3)+(y^2-2y-5)

(2y2-5y+3)+(y2-2y-5)

Remove parentheses.

2y2-5y+3+y2-2y-5

Add 2y2 and y2.

3y2-5y+3-2y-5

Subtract 2y from -5y.

3y2-7y+3-5

Subtract 5 from 3.

3y2-7y-2

Add (2y^2-5y+3)+(y^2-2y-5)