Question

Vcs podem me ajudar?

Answer 1

resposta:  q)x + x = 20

                        4  

r)x - x = 21

2  5

s) x -x =6 + x = 8x

      3         2

t)x + 1 =2x -1 = 1x

      2    3      

Answer 2

q)

x + x/4 = 20

x/1 + x/4 = 20

(4 . x + 1 . x)/4 = 20

5x/4 = 20

5x = 20 . 4

5x = 80

x = 80/5

x = 16

r)

x/2  - x/5 = 21

(-x . 2 + 5 . x)/(2 . 5) = 21

(-2x + 5x)/10 = 21

3x/10 = 21

3x = 21 . 10

3x = 210

x = 210/3

x = 70

s)

x - x/3 = 6 + x/2

(3 . x - x)/3 = 6 + x/2

2x/3 = 6 + x/2

2x/3 - x/2 = 6

(2 . 2x - x . 3) / (3 . 2) = 6

(4x - 3x) / 6 = 6

x = 6 . 6

x = 36

t)

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

x - 2x/3 = -1 - 1/2

(3 . x - 2x)/3 = -2/2 -1/2

x/3 = -3/2

x = -3/2  . 3

x = -9/2