68
| 7x-2x=5x
a-3a=-2a 10a-18a=-8a -4b-2b=6b 3bc-17bc=-14bc |
28a2-17a2=11a2
4b2c-12b2c=-8b2 17a2b2-9a2b2=8a2b2 24b2c3-(-17)b2c3=41b2c3 |
69
A2bc+2abca+(-3bca2)=0
(-aba2)+7a2ba+a3b=7a3b
7a2+(-3a2)+(-4a2)=0
70
| 3abc-7abc=-4abc
5a-6a=-1a |
9a3b2-9a3b2=0a3b2
7a-a=6a |
71
18a2b-4a2b+6a2b=20aab
4b3c4+8b3c4-14b3c4=-2b3c4
2,1a2e-1,6a2e+1,5a2e=2a2e
5,18a2p3+3,22a2p3-2,4a2p3=6a2p3
6a8b2+7a8b2+(-2)a8b2=11a8b
0c2e5+4c2e5-16c2e5=-12c2e5
6,4a4k+2,14a4k=-0,06a4k
7,14ax2+4,36ax2-12,8ax2=-1,3ax2
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