Question

820. 1) -2(x + 3) - 2x - 1; 3) -(3x - 4) - 3x - 8;2) 2/2 - y) = y - 5;4) 2a - (14 - 3a) -10.​

Answer 1

-2х-6=2х-1

-2х-6+6=2х-1+6

-2х=2х+5

-2х-2х=2х+5-2х

-4х=5

х=5/4

2)2(2 - у) = у - 5

4 - 2у = у - 5

у + 2у = 4 + 5

3у = 9

у = 9/3

у = 3

3)-3х+4=3х-8

2a-14+3a=-10

5a=-10+14

5a=4

а=4/5

а=0,8-3х-3х=-8-4

-6х=-12

х=(-12):(-6)

х=2

4)2a-14+3a=-10

5a=-10+14

5a=4

а=4/5

а=0,8

Answer 2

Let's simplify each of the expressions step by step:

1. -2(x + 3) - 2x - 1:

First, distribute the -2 to both terms inside the parentheses: -2x - 6 - 2x - 1

Now, combine like terms: -2x - 2x - 6 - 1

Combine the x terms and constants: -4x - 7

So, the simplified expression is -4x - 7.

2. 2/2 - (y - 5):

First, simplify inside the parentheses: 2/2 - y + 5

Now, simplify further: 1 - y + 5

Combine the constants: 6 - y

So, the simplified expression is 6 - y.

3. -(3x - 4) - 3x - 8:

First, distribute the negative sign to both terms inside the parentheses: -3x + 4 - 3x - 8

Now, combine like terms: -3x - 3x + 4 - 8

Combine the x terms and constants: -6x - 4

So, the simplified expression is -6x - 4.

4. 2a - (14 - 3a) - 10:

First, distribute the negative sign to both terms inside the parentheses: 2a - 14 + 3a - 10

Now, combine like terms: (2a + 3a) - (14 + 10)

Combine the a terms and constants separately: 5a - 24

So, the simplified expression is 5a - 24.