3-5 / 7 х = 1 - 3 / 7 х

1/8 х - 2 = 5/8 х + 1

с решением

1) 3-5/7x=1-3/7x

21x-5 / 7x=7x-3 / 7x

7x (21x-5) = 7x (7x-3)

21x-5=7x-3

21x-7x=-3+5

14x=2

X=1/7

2) 1/8x - 2=5/8x + 1

1-16x/8x=5+8x/8x

8x (1-16x) = 8x (5+8x)

1-16x=5+8x

-16x-8x=5-1

-24x=4

X=-1/6