Question

1< 3х – 2 < 13?
Quais são as soluções para

Answer 1

1< 3х – 2 < 13

1-1< -1+3х – 2 <-1+13

0 < +3х – 3 < 12

0 < +3х – 3 < 12

$3x - 3 < 12 \\ 3x - 3 > 0$

$3x < 15 \\ x < 5 \\ \\ 3x - 3 > 0 \\ 3x > 3 \\ x > 1$

$\boxed{ \boxed{ \underbrace{S=[1<X<5]}}}$