Question

18. (Unaerp) Se 3 < 5 - 2x < 7, então:
c) -1 < x > 1
a) -1 < x < 1
d) x = 1
b) 1 < x < -1
e) x = 0​

Answer 1

3< 5 - 2x < 7

3 - 5 < - 2x < 7 - 5

- 2 < - 2x < 2

-2/-2 < x < 2 / -2

1 > x > - 1

Arrumando...

- 1 < x < 1

R.: Letra "A"