6b + 20 equals a and 4b + 30 equals a b equals?

b=5

Step-by-step explanation:

So, they basically equal each other since they both equal a.

6b+20=4b+30

Your first step is to move the variable to one side, by that I mean to subtract. You have to subtract the smallest number that has a variable, in this case it would be 4b.

6b+20 = 4b+30

-4b - 4b

Once you have subtracted the variable, and now that there is only one variable in the equation, you have to subtract 20, since that is the opposite of adding.

2b+20=30

-20 - 20

Then, you have to divide 2 from 10, since that is the opposite of multiplying.

2b=10

2 2

Conclusion - b=5