Simplify: $$3\left(\left(\frac{7}{3}\right)x^2 - 25x + 12\right) - 7 \left(x^2 + 9x - 13\right)$$.

Correct option is B

Given:​

​$$3\left(\left(\frac{7}{3}\right)x^2 - 25x + 12\right) - 7 \left(x^2 + 9x - 13\right)$$ 

Solution: 

$$3\left(\left(\frac{7}{3}\right)x^2 - 25x + 12\right) - 7 \left(x^2 + 9x - 13\right) \\ \ \\ = \left(7x^2 - 75x + 36\right) - \left(7x^2 + 63x - 91\right) \\ \ \\ = 7x^2 - 75x + 36 - 7x^2 - 63x + 91 \\ \ \\ = -138x +127$$​