What does this answer mean? Like, what is a “solution set” and an “identity?” I know what multiplicative (x1) and additive identities (+0) are, but what is this? What is true for any value of x? That 4 = 4? And if so, what does that even mean? Solve 2(x + 1) - (x - 2) = x + 4 for x.
SOLUTION
2(x + 1) - (x - 2) = x + 4
2x + 2 - x + 2 = x + 4
x + 4 = x + 4
4 = 4

“This is true for any value of x. The solution set is all real numbers. This equation is an example of identity.”