Answer :

2/3+3k/4=71/12 
71/12  - 2/3 
=( 71- 8)/12
= 63/12 = 21/4
3k/4 = 21/4
k = 21/4* 4/3
k = 7

2/3 +3k/4 =71/12

3k/4= 71/12-2/3

3k/4= 71/12-8/12

3k/4=63/12

3k*12=63*4

36k=252

k=252/36

k=7

Hope i helped you!

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