To subtract the expression \((u + 7)\) from \((9u + 8)\), follow these steps:
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Distribute the negative sign across the second expression: \[ (9u + 8) - (u + 7) = (9u + 8) - u - 7 \]
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Combine like terms: \[ 9u - u + 8 - 7 = (9u - 1u) + (8 - 7) \] \[ = 8u + 1 \]
So, the result of the subtraction is: \[ 8u + 1 \]