12 (x^2-x-1) + 13 (x^2-x-1) = 25 (x^2-x-1)

What does x equal?

x = any real number

Step-by-step explanation:

12 (x^2-x-1) + 13 (x^2-x-1) = 25 (x^2-x-1)

Combine like terms on the left side

The items inside the parentheses are identical so

25 (x^2-x-1) = 25 (x^2-x-1)

Subtract 25 (x^2-x-1) from each side

25 (x^2-x-1) - 25 (x^2-x-1) = 25 (x^2-x-1) - 25 (x^2-x-1)

0=0

This is always true, so x can be any real number

X equals all real numbers