Ответ:
63; - 36/7; 22,5; 1
Пошаговое объяснение:
1) 1/14X - 3 = 2/21 X
1/14X - 2/21 X = 3
3/21 X - 2/21 X = 3
1/21 X = 3
X = 3 : 1/21
X = 3 x 21/1 = 63
2) 2/9 X - 4 = X
2/9 X - X = 4
2/9 X - X/1 = 4
2/9 X - 9/9 X = 4
- 7/9 X = 4
X = 4 : (- 7/9) = 4 x (- 9/7) = - 36/7
3) X - 5 = 3/4 X + 5/8
X - 3/4 X = 5/8 + 5
1/4 X = 5 5/8
1/4 X = 45/8
X = 45/8 : 1/4 = 45/8 x 4/1 = 45/2 = 22,5
4) 3/2 X - 2,5 = X
3/2 X + X = 2,5
1 3/2 X = 2,5
5/2 X = 2 5/10
5/2 X = 25/10
5/2 X = 5/2
X = 5/2 : 5/2 = 5/2 x 2/5 = 1