Perform the following
16. Add 7x + 6 and 8x - 3
17 Add x + 1 and x - 1
18. Add 2x + y and x + y
19. Subtract 7x + 6 by 8x - 3
20. Subtract x + 1 by x - 1
![Perform The Following16 Add 7x 6 And 8x 317 Add X 1 And X 118 Add 2x Y And X Y19 Subtract 7x 6 By 8x 320 Subtract X 1 By X 1 class=](https://ph-static.z-dn.net/files/d2b/ada2be82f2571b7a1b760edb2e4d8474.jpg)