b = 8 degrees
The sum of the three angles of any triangle is equal to 180 degrees.
[tex]\begin{gathered} 15b-26+5b+46=180^0(sum\text{ of angle in a triangle)} \\ \text{seperate similar terms} \\ 15b+5b+46-26=180^0 \\ 20b+20=180^0 \\ \\ \text{seperate similar terms} \\ 20b=180-20 \\ 20b=160 \\ \text{divide both sides by 20} \\ \frac{20b}{20}=\frac{160}{20} \\ \\ b=8^0 \end{gathered}[/tex]
