Question

Determine a raiz da equações abaixo.

a) 2x+5=6
b) -8x-12= -3x+33
c) 6x+12=2x-8
d) x + x - 6 = 17 - 2x + 1
e) x + 2x + 3 + 5x = 4x - 9

Answer 1

Resposta:

a)

$2x + 5 = 6 \\ 2x = 6 - 5 \\ 2x = 1 \\ x = \frac{1}{2}$

b)

$- 8x - 12 = - 3x + 33 \\ - 8x + 3x = 33 + 12 \\ - 5x = 45 \\ - x = 45 \div 5 \\ - x = 9 \\ x = - 9$

c)

$6x + 12 = 2x - 8 \\ 6x - 2x = - 8 - 12 \\ 4x = - 20 \\x = - 20 \div 4 \\ x = - 5$

d)

$x + x - 6 = 17 - 2x + 1 \\ 2x - 6 = 18 - 2x \\ 2x + 2x = 18 + 6 \\ 4x = 24 \\ x = 24 \div 4 \\ x = 6$

e)

$x + 2x + 3 + 5x = 4x - 9 \\ 8x + 3 = 4x - 9 \\ 8x - 4x = - 9 - 3 \\ 4x = - 12 \\ x = - 12 \div 4 \\ x = - 3$