Question

Resolva as seguintes equações:

a) 5x+21=10x-19

b) 7x+11=15+5x

c) 21+9x=15x+3

d)16-11x+12=15x​

Answer 1

Oi....

a) 5x + 21 = 10x - 19

5x - 10x = - 19 - 21

- 5x = - 40 ( - 1)

5x = 40

x = 40/5

x = 8

b) 7x + 11 = 15 + 5x

7x - 5x = 15 - 11

2x = 4

x  = 4/2

x = 2

c) 21 + 9x = 15x + 3

9x - 15x = 3 - 21

- 6x = - 18 ( - 1)

6x = 18

x = 18/6

x = 3

d) 16 - 11x + 12 = 15x

28 - 11x = 15x

- 11x - 15x = - 28

- 26x = - 28 (- 1)

26x = 28

x = 28/26 ÷ 2

x = 14/13

Espero ter ajudado.