If: 6b+21 = 7b-21
Then: 6b-7b = -21-21
And: -b = -42
So: b = 42
63 plus 47 plus 42 plus 21 is equal to 173.
No because it contains an equal sign in it.
The mathematical statement 31 plus 21 equals 52 as a total.
Multiply the first equation by 3 to give 9x + 15y = 21
21+21+19+19=80
12 plus 9 equals 21.
The statement 10 plus 21 equals 31 in total. It can also be written as 10 + 21 = 31.
11 plus 5-10 plus 20-9 plus 14-10 is equal to 21
66.
This is not correct. If x=11, then 9+x=20. In order for 9+x=21 to be correct, x would have to be equal to 12.
273 13+8 = 21 and 13*21 = 273
5