Rearrange: Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation : (9*3)*6-(6*(9*3))=0 STEP 1 : Equations which are always true 1.1 Solve 0 = 0. This equation is a tautology (Something which is always true) Equation is alway true
20 represents the cost of the first sheet and then we add plus 4n which represents each additional sheets which leads out to A, our average cost per sheet.
