" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
= 17s + 5t - 2st - st - 2s + 4t
= (17 - 2)s + (5 + 4)t - (2 + 1)st
= 15s + 9t - 3st