To find the expression representing the sum of the two given expressions \((-5x + 10)\) and \((8x - 6)\), we start by adding them together:
\[ (-5x + 10) + (8x - 6) \]
Next, we combine the like terms. Start by grouping the \(x\) terms and the constant terms:
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Combine the \(x\) terms: \[ -5x + 8x = 3x \]
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Combine the constant terms: \[ 10 - 6 = 4 \]
Now, we can put the combined terms together:
\[ 3x + 4 \]
Thus, the sum of the expressions \((-5x + 10)\) and \((8x - 6)\) in simplest terms is:
\[ \boxed{3x + 4} \]