Question

3.19. Решите двойное неравенство $-2 textless frac{x}{4} textless 2$

Answer 1

$-2 textless frac{x}{4} textless 2$
$(-2 textless frac{x}{4} textless 2)4$

$-2 * 4 textless frac{x}{4} * 4 textless 2 * 4$

$-8 textless x textless 8$