Question

Solve (x + 2 < 5) ∩ (x - 7 > -6).
{x | 1 < x < 3}
{x | x < 3 or x > 1}
{all real numbers}

Answer 1

{x | 1 < x < 3}

Answer 2

(x+2<5) ∩ (x-7>-6) <=> (x<5-2) ∩ (x>7-6) <=> (x<3)∩(x>1).
=> {x| 1<x<3} is right!