To solve the equation \( -2x + 902 = 1,518 \), we can follow these steps:
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Subtract 902 from both sides: \[ -2x = 1,518 - 902 \] \[ -2x = 616 \]
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Divide both sides by -2: \[ x = \frac{616}{-2} \] \[ x = -308 \]
So, the best estimate for \( x \) is \( -300 \).