The distance from -4 to 3 on a number line is written as 3 - (-4), and that distance is then doubled, giving 2 * (3 - (-4)). What is the value?

Erklärung

Taking away a value below zero counts the four steps up to zero and the three beyond it, giving seven inside the bracket, and doubling seven gives fourteen. Reading the double sign as a plain subtraction shrinks the bracket to one below zero and loses the crossing of zero that the distance is made of, while reporting 7 stops at the distance itself and never doubles it.