Mathematics

Claudia Dorsey

12 August, 22:09

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 1?