To solve the equation \( 5x + 10 = 40 \), follow these steps:
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Subtract 10 from both sides of the equation:
\[ 5x + 10 - 10 = 40 - 10 \]
This simplifies to:
\[ 5x = 30 \]
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Next, divide both sides by 5:
\[ \frac{5x}{5} = \frac{30}{5} \]
This simplifies to:
\[ x = 6 \]
Therefore, the solution is \( x = 6 \).