Question

помогите решить уравнения
1) 1/4х - 3 = 1/8х + 5
2) 1/21х + 84 = 85 + 1/7х

Answer 1

2/8х-1/8х=3+5
1/8х=8
х=8:1/8
х=64

Answer 2

2) 1/21х-3/21х=85-84

Answer 3

-2/21х=1 х= 10,5

Answer 4

1/4x-3=1/8x+5
1/4x-1/8x=5+3
2/8x-1/8x=8
1/8x=8
x=8:1/8
x=64
Ответ: х= 64 
========================
1/21x+84=85+1/7x
1/21-1/7x=85-84
1/21x-3/21x=1
-2/21x=1
x=1 : (-2/21)
x=-21/2
x=-10  1/2
Ответ: х= -10  1/2