Question

quem responder ganhha 20 pontos 3.(x-1)-2x≥13

Answer 1

3x - 3 - 2x ≥ 13
x ≥ 13 + 3
x ≥ 16

Answer 2

$3.(x-1)-2x \geq 13\to \\\\ 3x-3-2x \geq 13\to \\\\ 3x-2x \geq 13+3\to \\\\ x \geq 16\\\\\\\\ \boxed{S=\{xER|~x \geq 16\}}$