-21+2(3-15)-(-3)(+7)+(-3)(-8)​

If 3x+8=3x+8 is it one solution or no solution

I’m really confused and need your assist me with this question i’ve never been taught

Nellie is analyzing a quadratic function f(x) and a linear function g(x). will they intersect? f(x) g(x) graph of the function f of x equals one half times x squared, plus 2 x g(x) 1 5 2 10 3 15