3m + 2m = - 5m, 2ft + 5ft = - 7ft, 3g x 2g = - 6g 2, 6mi/2hr - 3 mi/hr, 15 sec- 3 sec = - 12 sec, 21m/3m= - 7, 12N * 3m = - 36Nm, 9m - 6m= - 3m, 12g/3g - 4, 6s * 4s= - 24s2, 150v-50v= - 100v, 8mi/2hr= - 4mi/hr, 15km/3hr= - 5km/hr, 3N*3N= - 9N2, 16m / (2s*2s) - 4m/s2,

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