# How do you solve 7b-10+31=9b?

Mar 14, 2018

$\frac{21}{2}$ or $10.5$ in decimal form.

#### Explanation:

Start by subtracting the variables, so $9 b - 7 b = 2 b$. After that, you want to add $31 + \left(- 10\right) = 21$

So

21 = 2b#

Then divide both sides by $2$ to get

$\frac{21}{2} = b$

or

$b = 10.5$