A + 9 = 21 A = 21 - 9 A = 12
21 * 9 = 189
21-9 = 12
6x - 9 = 21 6x = 21 + 9 6x = 28 x = 28/6 Reduce to: x = 14/3
3
LCD(9, 21) = 63
9 multiplied by 21 is 189.
21
-12 = x+9 x+9 -9 = -12 -9 x = -21
no 9 + 10 = 19 11 + 10 = 21 9 + 12 = 21
The factors of 9 are: 1, 3, 9 The factors of 21 are: 1, 3, 7, 21
9/21 = 3/7