3-5b=10+2b

I'm not sure how to do this

Combine like terms 5b and 2b then you would end up with 3-7b=10 then subtract 3 from 10 and you would end up with - 7b=7

3-5b=10+2b

We move all terms to the left:

3-5b - (10+2b) = 0

We add all the numbers together, and all the variables

-5b - (2b+10) + 3=0

We get rid of parentheses

-5b-2b-10+3=0

We add all the numbers together, and all the variables

-7b-7=0

We move all terms containing b to the left, all other terms to the right

-7b=7

b=7/-7

b=-1