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Subtracting 5x from both sides of 9x = 5x + 20 gives

A9x = 20
B4x = 20
C14x = 20
D4x = 25
Answer & Solution
Correct answer: B. 4x = 20
9x - 5x = 4x on the left and 5x - 5x = 0 on the right, leaving 4x = 20.
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