Respuesta :

Hello!

We are given the equation below.

x+40=3x

We want to get all of the variables on side. First of all let's subtract 40 from both sides.

x=3x-40

Now we rearrange our equation so the commutative property will work.

x=3x+(-40)
x=-40+3x

Now we subtract 3x from both sides.

-2x=-40

We divide both sides by -2.

x=20

Our answer is A) 20.

I hope this helps!

Answer with explanation:

It is given that

⇒ (x+40)°=(3x)°

Subtracting ,x from both sides

⇒3 x° -x° =40°

⇒ 2 x°=40°

Dividing by, 2 on both sides

x=20°

Option A:→20°