You didn’t include a picture so it’s unsolveable
-3Ix + 7I = -12 (divide -3 from each side)
Ix + 7I = -12/3
Ix + 7I = -4
x + 7 = -4 or -x - 7 = -4
x = -11 or -x = 3
x = - 3
x = -3 or -11
60 seconds in a minute
12 goes into 60, 5 times,
So 5 * 28 = 140
140 claps per minute
0.5 minute is 30 seconds, half a minute so divide by 2,
140/2 = 70
70 times every 0.5 minutes
