Tony solves the linear equation 3 (x - 3) + 2x + 9 = 2x + 2 (x - 1) using the step shown below.
Step 1: 3x - 3 + 2x + 9 = 2x + 2x - 1
Step 2: 5x + 6 = 4x - 1
Step 3: 5x - 4x = - 1 - 6
Step 4: x = - 7
a. He incorrectly combined like terms.
b He incorrectly applied the addition and subtraction properties of equality.
c He incorrectly applied the multiplication and division properties of equality.
d He distributed incorrectly.
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