What is an expression that is equivalent to 15-5x

Aconvex octagon has interior angles that measures 73 degrees, 172 degrees, 132 degrees, 59 degrees, 154 degrees, 163 degrees, x degrees, 2x degrees find the value of the missing angles

What is the value of x? enter your answer in the box. photo attached.

Find the number of real number solutions for the equation. x2 + 5x + 7 = 0 0 cannot be determined 1 2