Resposta :
Olá
[tex]\LARGE{}3(5x - 30) = 2x + 100 \\ \LARGE{}15x - 90 = 2x + 100 \\ \LARGE{}15x - 90 - 2x = 100 \\ \LARGE{}15x - 2x = 100 + 90 \\ \LARGE{}13x = 100 + 90 \\ \LARGE{}13x + 190 \\ \LARGE{} \\ \\ \LARGE\boxed{x = \frac{190}{13} }[/tex]
[tex]{\large\boxed{\boxed{ { \large \tt BONS \: \: ESTUDOS \: MEU \: ANJO \:<3 }}}}[/tex]