a21+a14t5+a7t10-a14-a7t10-t15+t15-a21-3a7t10=3a7t10
Copyright © 2024 SCHOLAR.TIPS - All rights reserved.
Answers & Comments
a21+a14t5+a7t10-a14-a7t10-t15+t15-a21-3a7t10=3a7t10