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Simplifying 7(c + -21) = 21 Reorder the terms: 7(-21 + c) = 21 (-21 * 7 + c * 7) = 21 (-147 + 7c) = 21 Solving -147 + 7c = 21 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '147' to each side of the equation. -147 + 147 + 7c = 21 + 147 Combine like terms: -147 + 147 = 0 0 + 7c = 21 + 147 7c = 21 + 147 Combine like terms: 21 + 147 = 168 7c = 168 Divide each side by '7'. c = 24 Simplifying c = 24
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