To solve the equation \( 7(n - 3) = -21 \), follow these steps:
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Divide both sides by 7 to isolate the expression in parentheses: \[ n - 3 = \frac{-21}{7} \]
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Simplify the right side: \[ n - 3 = -3 \]
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Add 3 to both sides to solve for \( n \): \[ n = -3 + 3 \] \[ n = 0 \]
Thus, the solution is: \[ n = 0 \]