Alguien sabe donde puedo encontrar el libro de Matematicas 1, quinta edicion por Juan Antonio Cuellar Carvajal contestado?

What value of x is in the solution set of 4x – 12 s 16 + 8x?

Ithink i know it but i want to be sure so can you me out ?

The perimeter of an equilateral triangle is 4 cm more than the perimeter of a square and the length of a side of the triangle is 8 cm more than the length of a side of the aware. find the length of a side of the equilateral triangle