Question

Resolva as seguintes equações do 1º grau!
g) X + =12
h) + = 21
i) + = +
j) + = -9
k)4(x - 2) = 4 + 2(x - 1)
1) 3-(3x - 6) = 2x + ( 4 - x)
m) 5(x + 1) – 3(2x + 1) = 4(5 – x)​

Answer 1

k) 4(x - 2) = 4 + 2(x - 1)

4x - 8 = 4 + 2x - 2

4x - 2x = 4 - 2 + 8

2x = 2 + 8

2x = 10

x = 10 / 2

x = 5

l) 3 - (3x - 6) = 2x + (4 - x)

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

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

- 5x + x = - 2 - 3

- 4x = - 5

x = - 5 / - 4

x = 1,25

m) 5(x + 1) - 3(2x + 1) = 4(5 - x)

5x + 5 - 6x - 3 = 20 - 4x

5x - 6x + 4x = 20 + 3 - 5

5x - 2x = 23 - 5

3x = 18

x = 18 / 3

x = 6