Resposta :
HEY BRO
[tex]\tt \: 7x + 12 = 4x - 18 \\ \tt \: 7x - 4x = - 18 - 12 \\ \tt \: 3x = - 30 \\ \\ \tt \: x = - \frac{30}{3} = - 10. \\ \\ \huge\boxed{ \tt\frac{BURNS}{answers}}[/tex]
[tex]\tt \: 7x + 12 = 4x - 18 \\ \tt \: 7x - 4x = - 18 - 12 \\ \tt \: 3x = - 30 \\ \\ \tt \: x = - \frac{30}{3} = - 10. \\ \\ \huge\boxed{ \tt\frac{BURNS}{answers}}[/tex]