5/8b - 7/12b + 5/6b =1/4

Question

5/8b - 7/12b + 5/6b =1/4

Answer 1

5/8b-7/12b+5/6b=1/4,
15/24b-14/24b+20/24=1/4,
1/24b+20/24=1/4,
21/24b=1/4,
b=1/4:21/24=1/4*24/21=1/1*6/21,
b=6/21=2/7.