To solve for x, we need to get x alone on one side of the equation.
Add one to each side of the equation. Subtract 8x from each side of the equation. Divide both sides by -7. You should get 1 as the answer.
x = 1
First combine like terms from both sides, in this case moving the -8 to the left side and the x to the right side.
You do this by doing the opposite operation for the values.
Add 8 to both sides and cancel out -8.
-1 + x = 8x -8
Subtract x from both sides and cancel out x.
7 + x = 8x
Then it looks like this.
7 = 7x
Divide by 7 on both sides
The equation of the volume of the sphere:
If the diameter is 3cm, the radius is divided by 2, so 1.5cm.
Plug that in, 4/3π1.5^3
Use a calculator: