To solve for \( x \) in the equation
\[ x(8 + 2) + 3 = 2(5 + x) + 5(x + 1) - 6, \]
let's simplify it step by step.
- Simplify both sides:
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The left side: \[ x(8 + 2) + 3 = 10x + 3 \]
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The right side: \[ 2(5 + x) + 5(x + 1) - 6 = 10 + 2x + 5x + 5 - 6 = 7x + 9. \]
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So we have:
\[ 10x + 3 = 7x + 9. \]
- Move \( 7x \) to the left side:
\[ 10x - 7x + 3 = 9, \] which simplifies to:
\[ 3x + 3 = 9. \]
- Move \( 3 \) to the right side:
\[ 3x = 9 - 3, \] so,
\[ 3x = 6. \]
- Divide both sides by \( 3 \):
\[ x = 2. \]
The answer is \( C: 2 \).