Question

9x+x=? 31p-11p=? 7a-a-a=? 6c-5c+7c=? 4y+2y+4=? 3x+4x+5y=? 9×x×5=?
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Answer 1

9x+x=10x
31p-11p=20p
7a-a-a=5a
6c-5c+7c=8c
4y+2y+4=6y+4=2 (3y+2)
3x+4x+5y=7x+5y
9×x×5=45x