Answer:
Step-by-step explanation:
12x+9=3x+21
-3x -3x
9x+9=21
-9 -9
9x=12
/9 /9
x= 4/3
[tex]\frac{4}{3}[/tex] or 1 [tex]\frac{1}{3}[/tex]
12x + 9 = 3x + 21
12x - 3x = 21 - 9
9x = 12
x = [tex]\frac{4}{3}[/tex] or 1 [tex]\frac{1}{3}[/tex]
