To solve the equation \( 5(b + 6) = 18 \), follow these steps:
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Distribute the 5: \[ 5b + 30 = 18 \]
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Subtract 30 from both sides: \[ 5b = 18 - 30 \] \[ 5b = -12 \]
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Divide by 5: \[ b = \frac{-12}{5} \] \[ b = -2.4 \]
Therefore, the solution is \( b = -2.4 \).