Question

1) -3x = 21 2) 1,4x = 5,6 3) 18x = 9 4) 5-2(x-1) = 4-x 5) 7-2x = 2x-18

Answer 1

Ответ:

1) -3x=21

x=21÷-3

x= -7

2) 1,4x=5,6

x= 5,6÷1,4

x= 4

3) 18x=9

x=9÷18

x= 0,5

4) 5-2(x-1) =4-x

5-2x+2=4-x

-2x+x=4-5-2

-x=-3

x=3

5) 7-2x=2x-18

-2x-2x=-18-7

-4x=-25

x= 6,25

Answer 2

Ответ:

1)х = -7

2) х = 4

3)х = 1/2

4)х = 3

5)х = 25/4

Answer 3

It looks like you've provided a list of equations. It seems like you want to solve these equations for the variable "x". I'll go through each equation and solve for "x":

1. -3x = 21 Divide both sides by -3: x = -7

2. 1.4x = 5.6 Divide both sides by 1.4: x = 4

3. 18x = 9 Divide both sides by 18: x = 0.5

4. 5 - 2(x - 1) = 4 - x Distribute the -2 on the left side: 5 - 2x + 2 = 4 - x Simplify: -2x + 7 = 4 - x Add 2x to both sides: 7 = 4 - x + 2x 7 = 4 + x Subtract 4 from both sides: x = 3

5. 7 - 2x = 2x - 18 Add 2x to both sides: 7 = 4x - 18 Add 18 to both sides: 25 = 4x Divide both sides by 4: x = 25/4 x = 6.25

So, the solutions for each equation are:

1. x = -7
2. x = 4
3. x = 0.5
4. x = 3
5. x = 6.25