Perform the indicated operation.
6. 9x+2x-7
7.(13x + 12y) +(8x-5y)
8.(6x-9y) - (11x-2y)
9.(4x^2 +5x +9) + (-4x^2 + x-9)
10.(15x^2+6x-14y^2)-(15x^2+6x-14y^2)​


Sagot :

Answer:

6.11x-7

7.151y+8x

8.5x-2y