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Define x:
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Let the unknown number be x.
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Translate:
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Eight is subtracted from four times some number and the result is the sum of the number and 4:
4x - 8 = x + 4
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Solve x:
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4x - 8 = x + 4
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Subtract x from both sides:
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3x - 8 = 4
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Add 8 on both sides:
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3x = 12
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Divide by 3 on both sides:
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x = 4
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Answer: The number is 4.
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