Question

38) 2.(x - 1) = 4
39) 2.(x+4)= 32
40) 3.(x – 3)=-27
41) 4.(x + 2) = 20
42) 5.(x-3)=-35
43) 2.(2x + 1) = 14
44) 2.(x + 3) – x= 2x + 1
45) 7.(x-3) = 9.(x + 1) - 38
46) 5.(x - 3) - 4.(x + 2) = 3.(1 - 2x) + 2​

Answer 1

Explicação passo-a-passo:

38) 2.(x - 1) = 4=>

2x-2=4

2x=4+2

2x=6

x=6/2

x=3

39) 2.(x+4)= 32

2x+8=32

2x=32-8

2x=24

x=24/2

x=12

40) 3.(x – 3)=-27

3x-9= - 27

3x= - 27 + 9

3x= -18

x= -18/3

x= - 6

41) 4.(x + 2) = 20

4x+8=20

4x=20-8

4x=12

x=12/4

x=3

42) 5.(x-3)=-35

5x-15= -35

5x= - 35 + 15

5x= -20

x= -20/5

x= -4

43) 2.(2x + 1) = 14

2x+2=14

2x=14-2

2x=12

x=12/2

x=6

44) 2.(x + 3) – x= 2x + 1

2x+6-x=2x+1

2x-2x-x=1-6

-x= -5

x=5

45) 7.(x-3) = 9.(x + 1) - 38

7x-21=9x+9-38

7x-9x= -29+21

-2x= -8

x=8/2

x=4

46) 5.(x - 3) - 4.(x + 2) = 3.(1 - 2x) + 2

5x-15-4x-8=3-6x+2

x-23=3-6x+2

x+6x=5+23

7x=28

x=28/7

x=4