Question

1)-5x – 9 = 6x - 10
2)4x = 7 + 3(4x + 3)
3)5(3x + 1) + 2x = 4x + 5
4)3(7x - 1)-6(5x + 2) = 3
5)3x - 5(2x + 3) = 15 - 4(6x - 1)
6)1,9x +0,3(7 - x) = 2,1 - 0,28​

Answer 1

$1.9x + 2.1 - 0.3 = 2.1 - 0.28 \\ 1.9x = 0.3 - 0.28 \\ 1.9x = - 0.25 \\ x = - 0.83$

$3x - 10x - 15 = 15 - 24x + 4 \\ 3x + 24x - 10x = 15 + 15 + 4 \\ 17x = 34 \\ x = 34 \div 17 \\ x = 2$

$4)21x - 3 - 30x - 12 = 3 \\ 21x - 30x = 3 + 3 + 12 \\ - 9x = 18 \\ x = - 2$

$15x + 5 + 2x = 4x + 5 \\ 15x + 2x - 4x = - 5 + 5 \\ 13x = 0 \\ x = 0$

$4x = 7 + 12x + 9 \\ 4x - 12x = 7 + 9 \\ - 8x = 16 \\ x = 16 \div ( - 8) \\ x = - 2$

$- 5x - 9 = 6x + 10 \\ - 5x - 6x = 9 + 10 \\ - 11x = 19 \\ x = \frac{19}{ - 11} \\ x = - 1.72$

Answer 2

1)-5х-6х=-10+9

-11х=-1

х=-1/11

2)4х=7+12х+9

4х-12х=16

-8х=16

х=-2

3)15х+5+2х=4х+5

15х+2х-4х=5-5

13х=0

х=-13

4)21х-3-30х-12=3

21х-30х=3+3+12

-9х=18

х=-2

5)3х-10х-15=15-24х+4

3х-10х+24х=15+4+15

17х=34

х=2

6)1.9х+2.1-0.3х=2.1-0.28

1.9х-0.3х=2.1-0.28-2.1

0.6х=-0.28

х=-0.5