simplify 6x^2+7-2x-3x^2-5x+1

$$\\6x^2+7-2x-3x^2-5x+1\\
6x^2-3x^2-2x-5x+1+7\\$$

 

you can add (or subtract) your  $$x^2$$   terms

you can add (or subtract) your  $$x$$   terms

you can add (or subtract) your  constants   

 

You try - post your answer and we will tell you if it is correct :)