4/7х+5/14х-10/21х= 1/7 помогите!!

Question

4/7х+5/14х-10/21х=
1/7 помогите!!

Answer 1

4/7x + 5/14x -10/21x = 1/7
24/42x + 15/42x - 20/42x = 6/42
39/42x - 20/42x = 6/42
19/42x = 6/42
x = 6/42 : 19/42
x = 6/42 * 42/19 =6/19