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)= _____________
