A student solves: 3x − 7 = 14 and gets x = 7. Which step verifies the solution?
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A
Substitute 7 for x: 3(7) − 7 = 21 − 7 = 14 ✓
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B
Divide both sides by 3 first to get x = 7/3
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C
Add 7 to 14 to get 21, then divide by 7
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D
Multiply both sides by x to eliminate the variable