(3/14+5/21x):3/7=3 целых1/4

Question

(3/14+5/21x):3/7=3 целых1/4

Answer 1

(3/14+5/21x):3/7=3 1/4
3/14+5/21x=13/4*3/7
3/14+5/21x=39/28
5/21x=39/28-3/14
5/21x=33/28
x=33/28:5/21
x=99/20=4 19/20