Im crying right now i cant understand the steps kalee used to solve the equation –4x + 9 = 2x – 12x + 51 and the properties she used to justify each step are shown. find and identify each error. note: there are errors in both the mathematical work and the justifications

For one, in Step 2 the justification is wrong, the correct justification is that she used the addition property of equality. In Step 5, the justification is wrong because the subtraction property of equality is being used. Also, in Step 7 the work and justification is wrong. The correct work should be 6x/6 (divided by 6) = 42/6, the justification would be the division property of equality. And finally in Step 8 the answer should be x=7. Hopefully what I've explained is right. Have a good one :)