Question

(3x – 9)º
(X + 7)º
Value of X?

Answer 1

`\huge \boxed{X=8}`

Explanation:

The value of x is ⇒ 3x-9=x+7

Solve 3x-9=x+7

Add by 9 from both sides of equation.

`\displaystyle 3x-9+9=x+7+9`

Simplify.

`\displaystyle 3x=x+16`

Subtract by x from both sides of equation.

`\displaystyle 3x-x=x+16-x`

Simplify.

`\displaystyle 2x=16`

Divide by 2 from both sides of equation.

`\displaystyle (2x)/(2)=(16)/(2)`

Finally, simplify to find the answer.

`\displaystyle 16/2=8`

X=8, which is our answer.

Answer 2

If they're equal, x=8

Explanation:

3x-9=x+7. Add 9 to each side and sibtract x from each side. This leaves 2x=16. Divide by 2 to isolate x. x=8