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a + (a+d) + (a+2d) + (a+3d) = 40
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\]
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Substituting \( a = 7 \):
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\[
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+ (7+d) + (7+2d) + (7+3d) = 40
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\]
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Simplifying the equation:
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\[
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+ 7 + d + 7 + 2d + 7 + 3d = 40
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\]
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\[
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+ 6d = 40
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