Question

1) 5 - x/7 = 4

2) x/2 - x/4 + 7 = x/8 - x/6 + 21/2

3) 3x/4 - 1/5 + 2x = 5x/4 - 3x/20

4) 2x/5 + 2/3 = 3x/6 + x/2

5) x+10/8 = 3

6) x-1/2 = x+1/3

7) 3x-8/5 - x-1/4 + 7-x/3 = 8-2x - 8-5x/10

8) 2x-5/3 = 3-x + 3x-2/5

Alguem por favor ajuda aqui

Answer 1

1) 5 - x/7 = 4

35 - x = 28

-x = 28 - 35

-x = -7

x = 7

2) x/2 - x/4 + 7 = x/8 - x/6 + 21/2

12x - 6x + 168 = 3x = 4x + 252

6x + 168 = -x + 252

6x + x = 252 - 168

7x = 84

x = 84/7

x = 12

3) 3x/4 - 1/5 + 2x = 5x/4 - 3x/20

15x - 4 + 40x = 25x - 3x

55x - 4 = 22x

55x - 22x = 4

33x = 4

x = 4/33 = 0,12

4) 2x/5 + 2/3 = 3x/6 + x/2

12x + 20 = 15x + 15x

12x + 20 = 30x

12x - 30x = -20

-18x = -20

18x = 20

x = 20/18

x = 10/9 = 1,1

5) x+10/8 = 3

x + 10 = 24

x = 24 - 10

x = 14

6) x-1/2 = x+1/3

3(x-1) = 2(x+1)

3x - 3 = 2x + 2

3x - 2x = 2 + 3

x = 5

7) 3x-8/5 - x-1/4 + 7-x/3 = 8-2x - 8-5x/10

12(3x-8) - 15(x-1) + 20(7-x) = 480 - 120x - 6(8+5x)

36x - 96 - 15x + 15 + 140 - 20x = 480 - 120x + 48 + 30x

x + 59 = 432 - 90x

x + 90x = 432 - 59

91x = 373

x = 373/91 = 4,098901

8) 2x-5/3 = 3-x + 3x-2/5

5(2x-5) = 45 - 15x + 3(3x-2)

10x - 25 = 45 - 15x + 9x - 6

10x - 25 = 39 - 6x

10x + 6x = 39 + 25

16x = 64

x = 64/16

x = 4