(25/72х - 9/11) - (3/8х - 5/9) = 7/99
25/72х - 9/11 - 3/8х + 5/9 = 7/99
25/72х - 3/8х - 9/11 + 5/9 = 7/99
25/72х - 27/72х -81/99 + 55/99 = 7/99
- 2/72х - 26/99 = 7/99
-2/72х = 7/99 + 26/99
-2/72х = 33/99
-2/72х = 3/9
х = 3/9 : (-2/72)
х = 3/9 * (- 72/2)
х = 3/1 * (-8/2)
х = 3 * (-4)
х = - 12
--------------------------
0,5 * (4х + 3) = 2 * (0,7х + 4,5)
2х + 1,5 = 1,4х + 9
2х - 1,4х = 9 - 1,5
0,6х = 7,5
х = 7,5 : 0,6
х = 12,5
----------------------------------
(1,46 - 1/5х) - (0,86 - 2/9х) = 1
1,46 - 1/5х - 0,86 + 2/9х = 1
-1/5х + 2/9х = 1 - 1,46 + 0,86
-9/45х + 10/45х = 0,5
1/45х = 0,5
х = 0,5 : 1/45
х = 5/10 * 45/1
х = 5/2 * 9/1
х = 45/2
х = 22,5
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1 5/6 - 1 1/3х = 4/9 * ( 1 1/2х - 3/8)
11/6 - 4/3х = 4/9 * (3/2х - 3/8)
11/6 - 4/3х = 2/3х - 1/6
- 4/3х - 2/3х = - 1/6 - 11/6
- 6/3х = - 12/6
- 2х = - 2
х = 1
--------------------------------------------------------
(2 7/9х + 3 1/3) * 3/5 = 1/6х + 6 1/2
(25/9х + 10/3) * 3/5 = 1/6х + 13/2
5/3х + 2 = 1/6х + 13/2
5/3х - 1/6х = 13/2 + 2
10/6х - 1/6х = 17/2
9/6х = 17/2
3/2х = 17/2
х = 17/2 : 3/2
х = 17/2 * 2/3
х = 17/3 = 5 2/3
-----------------------------
2/3 * (4,2 - 9,6х) = 2,8 * (2/7 - 1/2х)
2/3 * 4,2 - 2/3 * 9,6х = 2,8 * 2/7 - 2,8 * 1/2х
14/5 - 32/5х = 4/5 - 7/5х
-32/5х + 7/5х = 4/5 - 14/5
-25/5х = 10/5
-5х = 2
х = - 2/5
-------------------------------------------
4/9 * (8,1 - 3,6) = 2,5 * (5/7 - 3/7х)
18/5 - 8/5 = 25/14 - 15/14х
10/5 - 25/14 = - 15/14х
3/14 = - 15/14х
х = 3/14 : (-15/14)
х = 3/14 * (-14/15)
х = - 1/5
---------------------------------------
(4 1/6 у + 11 1/4) * 4/15 = 2/3у + 5 2/3
(25/6у + 45/4) * 4/15 = 2/3у + 17/3
10/9у + 5 = 2/3у + 17/3
10/9у - 2/3у = 17/3 - 5
10/9у - 6/9у = 17/3 - 15/3
4/9у = 2/3
у = 2/3 : 4/9
у = 2/3 * 9/4
у = 3/2 = 1,5