Question

4. Encontre o valor do x:
a)x+x=-4?

b)2x+x=27?

c)2x = x - 12?

d)-3x= 2x - 25?

e)- x= 27 - 2x?

f) - 28 = 7x?

g) - 32+6 = 2x?​

Answer 1

RESPOSTA :-)

a)

$2x = - 4 \\ x = \frac{ - 4}{2} \\ x = - 2$

b)

$2x+x=27 \\ 3x = 27 \\ x = \frac{27}{3} \\ x = 9$

c)

$c)2x = x - 12 \\ 2x - x = - 12 \\ x = - 12$

d)

$-3x= 2x - 25 \\ - 3x - 2x = - 25 \\ - 5x = - 25 \\ x = 5$

e)

$- x= 27 - 2x \\ - x + 2x = 27 \\ x = 27$

f)

$- 28 = 7x \\ \frac{ - 28}{7} = x \\ x = - 4$

g)

$- 32+6 = 2x \\ - 26 = 2x \\ x = - \frac{ - 26}{2} = - 13$