[tex] \frak \red{answer}[/tex]
[tex] \frac{2}{3} b + 5 = 20 - b[/tex]
[tex] \frac{2}{3} b + b = 20 - 5[/tex]
[tex] \frac{2b + 3b}{3} = 15[/tex]
[tex]5b = 15 \times 3[/tex]
[tex]5b = 45[/tex]
[tex]b = \frac{45}{5} [/tex]
[tex] \purple{b = 9}[/tex]
Hope this helps if (b) is in the denominator...
