C. Master level
1. (5g+ 9h) + (-18g + 30) - (-5h-7)= ___________
2. (10x - 35 x2 + 10) + (-5x2 - 10x3 + 2x + 26)=____________
3. (60a4 + 30a3 + 11a + 2) - (10a4 - 15a2 - 17)= ______________
4. (55y4 + 33y3 + 11y +2) + (-6y4 - 22y2 + 8y - 17)= _____________
5. (26r3 - 10r - 35r2 + 10) - (-16r2 - 20r3 + 22)= _____________
![C Master Level1 5g 9h 18g 30 5h7 2 10x 35 X2 10 5x2 10x3 2x 263 60a4 30a3 11a 2 10a4 15a2 17 4 55y4 33y3 11y 2 6y4 22y2 8y 17 5 26r3 10r 35r2 10 16r2 20r3 22 class=](https://ph-static.z-dn.net/files/d63/d57664a41a2bb33769123db4c995314a.jpg)