15.{550: [450-(3.5^3-2^3.25)]}
= 15.{550: [ 450-(3.125-8.25)]}
= 15.{550:[ 450-( 375-200)]}
= 15.{550:[450- 175]}
=15.{550: 275}
= 15. 2
= 30
15 . { 550 : [ 450 - ( 3 . 53 - 23 . 25 )]}
= 15 . { 550 : [ 450 - ( 3 . 125 - 8 . 25 )]}
= 15 . { 550 : [ 450 - ( 375 - 200 )]}
= 15 . { 550 : [ 450 - 175 ]}
= 15 . { 550 : 275 }
= 15 . 2
= 30.
#Y/n
15 . { 550 : [ 450 - ( 3 . 5^3 - 2^3 . 25 ) ] }
= 15 . { 550 : [ 450 - ( 3. 125 - 8 .25 )]}
= 15 . { 550 : [ 450 - ( 375 - 200 )]}
= 15 . { 550 : [ 450 - 175 ] }
= 15 . { 550 : 275 )
= 15 . 2
= 30