1.6b - 8b - 17.28 = - 5.7b - 14.83

b=?

1st we combine like terms

1.6b minus 8b which equals - 6.4b

Now right out your new expression

-6.4b - 17.28 = - 5.7b - 14.83

Now add 5.7 to both side

-6.4b - 17.28 = - 5.7b - 14.83

+5.7b + 5.7b

This should get you what bellow and then add + 17.28 to both sides

-0.7b - 17.28 = - 14.83

+17.28. + 17.28

Almost done ...

Now you're left with

_-0.7b___ = _2.45___

-0.7b. - 0.7b

Answer = - 3.5

This app messed up the order of the numbers so I hope you can understand where things go