Respuesta :

Hello!

We will solve this equation below.

Add 123 to both sides.

12a=240

Divide both sides by 12.

a=20

Our answer is B) 20.

I hope this helps!
perixwinkle
Let's look at the equation.

12a-123=117; Our goal is to isolate the a. When try to find the value of a variable in an equation, you always do the reverse of PEMDAS. So we would add 123 to both sides to cancel it out on the left side. Then, we would divide both sides by 12 to get a by itself. Let's do that.

12a-123=117
     +123  +123
12a=240
÷12  ÷12
A=20

So b, A=20.

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