Question

5x -3+x= 2x +9
17x - 7x = x + 18
X + x 4 = 17 -2x +1
d) x + 2x +3 -5x = 4x -9
e) 5x + 6x -16 = 3x +2x -4
f) 5x + 4 = 3x-2x + 4​

Answer 1

Resposta:

$5x - 3 + x = 2x + 9 \\ 5x + x - 2x = 9 + 3 \\ 4x = 12 \\ x = 12 \div 4 \\ x = 3$

Answer 2

Resposta:

a) 5x - 3 + x = 2x + 9

-3 -9 = 2x - x - 5x

- 12 = -4x

- 12 = -4x .(-1)

12 = 4x

x = 12/4

x = 3

b) 17x - 7x = x + 18

-18 = x - 17x + 7x

-18 = -9x

-18 = -9x .(-1)

18 = 9x

x = 18/9

x = 2

c) x + x + 4 = 17 - 2x + 1

4 - 17 - 1 = -2x - x - x

-14 = -4x

-14 = -4x .(-1)

14 = 4x

x = 14/4

d) x + 2x + 3 - 5x = 4x - 9

3 + 9 = 4x + 5x - 2x - x

12 = 6x

x = 12/6

x = 2

e) 5x + 6x - 16 = 3x + 2x - 4

-16 + 4 = 3x + 2x - 5x - 6x

- 12 = -6x

- 12 = -6x .(-1)

12 = 6x

x = 12/6

x = 2

f) 5x + 4 = 3x - 2x + 4

4 - 4 = 3x - 2x - 5x

0 = -4x

x = -4x ou 4x