1) 10 - 7/10 × х = 1/2
3/10х = 1/2
10/3 × 3/10х = 10/3 × 1/2
х = 5/3
2) 5+4/20 × х = 4/5
9/20х =4/5
20/9 × 9/20х = 20/9 × 4/5
х = 4/9 × 4
х = 16/9
3) (3/8 + 3/4)х = 1/3
3+6/8 × х = 1/3
9/8х = 1/3
8/9 × 9/8х = 8/9 × 1/3
х = 8/27
4)(1/6 - 5/6)х = 3/4
1-5/6 × х = 3/4
(-4/6)х = 3/4
-2/3 х = 3/4
-3/2 × 2/3 х = 3/2 × 3/4
-х = 9/8
х = -9/8