Solve the equation 3x - 7 = 11.
Answer and explanation
Correct answer: C. x = 6
- Step 1: Add 7 to both sides: 3x = 18. Step 2. Divide both sides by 3: x = 6. Answer: x = 6. Why not the others: x = 4 skips the multiplication by 3; x = 3 divides the wrong number; x = -6 changes the sign of 18 for no reason.
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