Answer:
x=3
Step-by-step explanation:
3+4=7
3x7=21
3(x+4) = 21
3x+12 = 21
3x+ 12 = 21
-12 = + 12
3x = 9
[tex]\frac{3x}{3}[/tex] = [tex]\frac{9}{3}[/tex]
x = 3
