Mathematics

Anna Daniels

8 January, 07:00

Consider the sequence of steps to solve the equation: 3 (x - 4) + 5x = 9x - 36

Given = 3 (x - 4) + 5x = 9x - 36

Step 1 = 3x - 12 + 5x = 9x - 36

Step 2> 3x + 5x - 12 = 9x - 36

Step 3 = 8x - 12 = 9x - 36

Step 4 8x - 8x - 12 = 9x - 8x - 36

Step 5 = 0 - 12 = x - 36

Step 6 - 12 = x - 36

Step 7 - 12 + 36 = x - 36 + 36

Step 8 = 24 = x + 0

Step 9 = 24 = x

Which property yields Step 4?