## Algebra 1: Common Core (15th Edition)

$b=-4$
The fractions on the left side of the equation already have a common denominator of 13. Thus, we can subtract the numerators to get that $-2b/13=8/13$. To cancel out the two denominators, we multiply both sides of the equation by 13 to get that $-2b=8$. In order to cancel out multiplication, we use division, so we divide both sides by -2 to get that $b=-4$. We plug -4 in for b and confirm that our answer is, indeed, correct.