Question

Решить двойное неравенство

Answer 1

a)
-3 <= (5 + 3x)/4 <= -1
-12 <= 5 + 3x <= - 4
 - 17 <= 3x <= -6
 (-17/3) <= x <= -2

Б)
10 < 7 - 4x < 20
 -3/4 < x < -3 1/4