Simplify: x² + 5x - 12 - 3(x² - 2x + 9).

Simplify x(5x − 9) + 7(x² − 2) + 17

Simplify $$2\left(\left(\frac{6}{2}\right)x^2-22x+15\right)-6(x^2+5x-18)$$.

Simplify x(6x – 3) + 5(x² – 4) + 18.

Find x in the following expression: $$5\frac 37-x=3 \frac5{14}$$​​

Find the value of p so that the expression (15.97)³ + 1.4373 × p + (0.03)³ is a perfect cube.

Find the value of x satisfying: 2(3x² − 6) − 3(2x² + 8x − 5) = 14

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

The value of 691 × 709 is:

Simplify (5x − 2y)² + (2x + 5y)² + (5x + 2y)(5x − 2y).

Simplify (2x − 5y)² + (5x + 2y)² + (2x + 5y)(2x − 5y).