3(x+2)=20-4x

$3(x+2)=20-4x$

= $3x + 6 = 20-4x$

= $3x + 6 + 4x = 20$

= $3x + 4x = 20 - 6$

= $7x = 14$

 = $x = 2$

Let's check our work

= $3(2 + 2)=20- 4(2)$

= $3(4)=20-8$

= $12 = 12$

X = 2