02:40 duration 2 minutes 40 seconds
Prealgebra 3.8.1
Solve for x 3x/4 = 15
01:28 duration 1 minute 28 seconds
Prealgebra 3.6.4
10/21 * 14a/15
00:32 duration 32 seconds
Prealgebra 3.4.3
2/3 * 13