Answer:
x = -18
Step-by-step explanation:
[tex]x + 21 - \frac{1}{3}x = 9[/tex]
Combine x and [tex]\frac{1}{3}[/tex] to get [tex]\frac{2}{3} x[/tex].
[tex]\frac{2}{3}x + 21 = 9[/tex]
Subtract 21 from both sides.
[tex]\frac{2}{3} x = 9 - 21[/tex]
Subtract 21 from 9 to get −12.
[tex]\frac{2}{3}x = -12[/tex]
Multiply both sides by [tex]\frac{3}{2}[/tex], the reciprocal of [tex]\frac{2}{3}[/tex].
[tex]x = 12[/tex] × [tex](\frac{3}{2} )[/tex]
Express −12 × [tex](\frac{3}{2})[/tex] as a single fraction.
[tex]x = \frac{-12 x 3}{2}[/tex]
Multiply −12 and 3 to get −36.
[tex]x = \frac{-36}{2}[/tex]
Divide −36 by 2 to get −18.
x = -18
hope it helps and have a great day! =D
~sunshine~
