To solve the equation \( \frac{3}{4} + r = 1 \), you need to isolate \( r \).
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Subtract \( \frac{3}{4} \) from both sides of the equation: \[ r = 1 - \frac{3}{4} \]
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To subtract \( \frac{3}{4} \) from 1, you can express 1 as \( \frac{4}{4} \): \[ r = \frac{4}{4} - \frac{3}{4} \]
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Now perform the subtraction: \[ r = \frac{4 - 3}{4} = \frac{1}{4} \]
Therefore, the value of \( r \) is \( \frac{1}{4} \).