What is the solution of 2(x + 4) - x = 15? solve in a easy way

The diagonals of a quadrilaretral intersect at (-1,4). one of the sides of the quadrilateral is bounded by (2,7) and (-3,5) determine the coordinates of the other side in order for the quadrilaretral to be a square.

Write the equations in logarithmic form 7^3=343

Suppose the equation ||x-a|-b|=2008 has 3 distinct real roots and a not =0. find the value of b.