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How did this expression get simplified to this?


15 = 5 (675 - 3 210) - 210


to


15 = 5 675 - 16 210

Verified Answer :

(leave the 15 alone for the duration of the sum)

= 5675 - 53210 - 210  ------------------------------ time's out bracket
 =5675 -210(53 +1)  ---------------------------- took out common "-210" out of last 
                                                                       two terms'
= 5675 -210(15+1)
= 5675 -210(16)
=5675 -210*16

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