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13 is to 8 as x + 4 is to x
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13 is to 8 as x + 4 is to x

User Vesperae
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(13)/(8) = (x+4)/(x) \\ 13 * x = 8(x+4) \\ 13x = 8x + 32 \\ 5x = 32 \\ x = 6.4
User Eino Gourdin
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