Question 523638
x + y + z = 237
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y = 2x -9
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z = 3x +6
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substitute
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x +2x-9 +3x+6 = 237
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6x -3 = 237
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6x = 240
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x = 40
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substitute
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y = 2x -9
y = 2*40 -9
y = 71
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z = 3x +6
z = 3*40 +6
z = 126
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Check the sum
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40 + 71 + 126 = 237
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Answer: The three numbers are 40, 71, and 126.
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Done.