Пошаговое объяснение:
1. 9х - 26 = 30 - 5х
9х +5х = 30+26
14х = 56
х=56 : 14
х=4
2. 0.9х - 7,4 = - 0,4х + 4,3
0.9х+0.4х = 4.3+7.4
1.3х = 11.7
х = 11.7 : 1.3
х= 9
3. 7х + 9 - (11х - 7) = 8
7х + 9 - 11х + 7 = 8
7х-11х = 8-9-7
-4х = -8
х=-8 : (-4)
х=2
4. 0,4(6 - 4х) = 0,5(7 - 3х) - 1,5
2.4 - 1.4х = 3.5-1.5х -1.5
- 1.4х+1.5х = 3.5 -1.5 - 2.4
0.1х = -0.4
х= -0.4 : 0.1
х= -4
5. 5/6(1/2х - 2/3) = 3х - 2.1/4
Пошаговое объяснение:
1. 9х - 26 = 30 - 5х
9х +5х = 30+26
14х = 56
х=56 : 14
х=4
2. 0.9х - 7,4 = - 0,4х + 4,3
0.9х+0.4х = 4.3+7.4
1.3х = 11.7
х = 11.7 : 1.3
х= 9
3. 7х + 9 - (11х - 7) = 8
7х + 9 - 11х + 7 = 8
7х-11х = 8-9-7
-4х = -8
х=-8 : (-4)
х=2
4. 0,4(6 - 4х) = 0,5(7 - 3х) - 1,5
2.4 - 1.4х = 3.5-1.5х -1.5
- 1.4х+1.5х = 3.5 -1.5 - 2.4
0.1х = -0.4
х= -0.4 : 0.1
х= -4
5. 5/6(1/2х - 2/3) = 3х - 2.1/4