Question

Me ajudem pfv
2(x-3) - 4(x + 1) < 20 + x

Answer 1

2(x-3) - 4(x + 1) < 20 + x
2x - 6 - 4x - 4 < 20 + x
2x - 4x - x < 20 + 6 + 4
- 3x < 30 . (-1)
3x > - 30
x > - 30/3
x > - 10

Answer 2

$2(x-3) - 4(x + 1) \ \textless \ 20 + x\to \\\\ 2x-6-4x-4\ \textless \ 20+x\to \\\\ 2x-4x-x\ \textless \ 20+6+4\to \\\\ -3x\ \textless \ 30(-1)\to \\\\ 3x\ \textgreater \ -30\to \\\\x\ \textgreater \ \frac{-30}{3} \to \\\\x\ \textgreater \ -10\\\\\\ S=\{xER|x\ \textgreater \ -10\}$