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To avoid rollbacks when you start, you should

A partly engage the clutch before you take your right foot off the brake.
Explaination
When you start your vehicle, avoid rolling backward or else you may hit someone behind you. Set the parking brake whenever necessary to keep from rolling back. Release the parking brake only when you have applied enough engine power to keep from rolling back. If you have a manual transmission vehicle, partly engage the clutch before you take your right foot off the brake. On a tractor-trailer equipped with a trailer brake hand valve, the hand valve can be applied to keep from rolling back.
B engage the clutch very quickly.
C stop on a flat area.