Question

-1 < 3-2x/5 <(или равно) 9

Answer 1

-1 < (3-2x)/5 ≤ 9

-5 < 3-2x ≤ 45

-8 < -2x ≤ 42

4 > x ≥ -21

-21 ≤ x < 4

x ∈ [-21;4)

Answer 2

$-1<\frac{3-2x}{5} \leq 9\\\\\frac{3-2x}{5} >-1\\\\\frac{3-2x}{5} \leq 9\\\\x<4\\x\geq -21\\\\x$∈[-21; 4)