50 ! решите уравнения! ! 1. 8х + 5,9 = 7х + 20; 2. 6х - 8 = -5х - 1,6; 3. 15у - 8 = -6у + 4,6; 4. 16z + 1,7= 2z – 1; 5. 6х - 12 = 5х + 4; 6. - 9α + 8 = - 10α – 2; 7. 7m + 1 = 8m + 9; 8. - 12n - 3 = 11n – 3; 9. 4 + 25у = 6 + 24у; 10. 11 - 5z = 12 - 6z;

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1)
8х + 5.9 = 7х + 20
8х - 7х = 20 - 5.9
х = 14.1
2)
6х - 8 = -5х - 1.6
6х + 5х = 8 - 1.6
11х = 6.4
х = 0.58
3)
15у - 8 = - 6у + 4.6
15у + 6у = 8 + 4.6
21у = 12.6
у = 0.6
4)
16z + 1.7 = 2z - 1
16z - 2z = - 1.7 - 1
14z= - 1.8
z = - 0.12
5)
6x - 12 = 5x + 4
6x - 5x = 12 + 4
x = 16
6)
- 9a + 8 = - 10a - 2
- 9a + 10a = - 8 - 2
a = -10
7)
7m + 1 =8m + 9
7m - 8m = -1 + 9
- m = 8
m = -8
8)
- 12n - 3 = 11n - 3
- 12n - 11n = 3 - 3
- 23n = 0
9)
4 + 25y = 6 + 24y
4 - 6 = - 25y + 24y
- 2 = -y
y = 2
10)
11 - 5z = 12 - 6z
- 5 + 6z= - 11 + 12
z = 1