The first two steps to solve the equation 3x2−7=47+7xare shown below:Step 1: 3x2−7x−7−47=0Step 2: 21x2−49x−49−4=0Which property is applied in step 1 to obtain step 2?Adivision property of equalitydivision property of equalityBaddition property of equalityaddition property of equalityCmultiplication property of equalitymultiplication property of equalityDsubtraction property of equality