O valor da equação 7x + 45 = 2x + 100 é:a)10b)11c)12d)13

Explicação passo-a-passo:

7x-49=4x-22

7x - 4x = - 22 + 49

3x = 27

x = 27/9

x = 3

12x-48=10x-72

12x - 10x = - 72 + 48

2x = - 24

x = - 24/2

x = - 12

3x+10+x=x+30

3x + x - x = 30 - 10

3x = 20

x = 20/3

9x+30=8x-20

9x - 8x = - 20 - 30

x = - 50

14x+45=15x-80

14x - 15x = - 80 - 45

- x = - 125

x = 125

8x+28+2x=11x-55

8x + 2x - 11x = - 55 - 28

- x = - 83

x = 83

6x+12+3x=12x+93

6x + 3x - 12x = 93 - 12

9x - 12x = 81

- 3x = 81

x = 81/3

x = 27

-7x+49=8x-11

- 7x - 8x = - 11 - 49

- 15x = - 60

x = - 60/-15

x = 4

-6x+18=-8x+30

-6x + 8x = 30 - 18

2x = 12

x = 12/2

x = 6

25x+100=24x-90

25x - 24x = - 90 - 100

x = - 190

-2x+18-3x=14+x

-2x - 3x - x = 14 - 18

-6x = - 4

x = - 4/-6

-7x+6x=12+32

- x = 44

x = - 44

8x+20=-10x-16

8x - 10x = - 16 - 20

- 2x = - 36

x = - 36/-2

x = 18

3x+72=5x+144

3x - 5x = 144 - 72

-2x = 72

x = 72/-2

x = - 36

6x+12=4x+60

6x - 4x = 60 - 12

2x = 48

x = 48/2

x = 24

7x+50=5x-120

7x - 5x = - 120 - 50

2x = - 170

x = - 170/2

x = - 85

13x-48=15x+100

13x - 15x = 100 + 48

- 2x = 148

x = 148/-2

x = - 74

12x-128=20x+12

12x - 20x = 12 + 128

-8x = 140

x = 140/-8

x = - 17,5

-12x+20=-10x-32

-12x + 10x = - 32 - 20

-2x = - 52

x = - 52/-2

x = 26

50x+100=+48xc+102

50 - 48x = 102 - 100

2x = 2

x = 2/2

x = 1

-6x+18-x=2x+38

-6x - x - 2x = 38 - 18

-9x = 20

x = 20/-9

-2x+3x-6=-x+18

-2x + 3x + x = 18 +6

2x = 24

x = 24/2

x = 12

-12x+14x=80-32

2x = 48

x = 48/2

x = 24

8x+40=6x-18

8x - 6x = - 18 - 40

2x = - 58

x = - 58/2

x = - 29

2x+8x=6x+20

2x +8x - 6x = 20

4x = 20

x = 20/4

x = 5