Question

Помогите решить уравнения по математике
х+1/8=3/5
x-3/20=1/5
x-3/7=4/21

Answer 1

1) x = 3/5 - 1/8 = 24/40 - 5/40 = 19/40
2) x = 1/5 + 3/20 = 4/20 + 3/20 = 7/20
3) x = 4/21 + 3/7 = 4/21 + 9/21 = 13/21