subtrack k from 7 then triple the result
Subtract k from 7: k-7
then triple the result: 3(k-7)
if you want to solve for k then
3(k-7)
=3k - 21
or 3k = 21
divide both sides by 3
3k/3 = 21/3
k =7
Subtracting k from 7, = k - 7Tripling the result means multiplying by 3 = 3(k - 7)= 3k - 3*7= 3k - 21I hope this helps.
