Question

Решите двойное неравенство -7 <7-2x <=5

Answer 1

-7 < 7 - 2x <=5

-7 -7  <-2x <= 5 - 7

-14 < -2x <= -2

-14/-2 > x >= -2/-2

1 <= x < 7

x∈[1, 7)