Solve for x: x - 9 = 3.

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Multiple Choice

Solve for x: x - 9 = 3.

Explanation:
When you see x minus 9 equals 3, you undo the subtraction by adding the opposite number to both sides. So add 9 to both sides: x - 9 + 9 = 3 + 9, which gives x = 12. This value works because 12 minus 9 equals 3. If you plug in other numbers, they don’t satisfy the equation: for example, 3 would give 3 - 9 = -6, 9 would give 9 - 9 = 0, and -12 would give -12 - 9 = -21. Only 12 makes the left side equal to 3.

When you see x minus 9 equals 3, you undo the subtraction by adding the opposite number to both sides. So add 9 to both sides: x - 9 + 9 = 3 + 9, which gives x = 12. This value works because 12 minus 9 equals 3.

If you plug in other numbers, they don’t satisfy the equation: for example, 3 would give 3 - 9 = -6, 9 would give 9 - 9 = 0, and -12 would give -12 - 9 = -21. Only 12 makes the left side equal to 3.

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