Why do people recommend moving the smaller value of x when solving equations with variables on both sides?

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

Apply the distributive property to simplify the expression. −4(5x + 2)

Convert the density of surface sea water to metric tons/cubic meter