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Simplifying 7(c + -13) = -21 Reorder the terms: 7(-13 + c) = -21 (-13 * 7 + c * 7) = -21 (-91 + 7c) = -21 Solving -91 + 7c = -21 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '91' to each side of the equation. -91 + 91 + 7c = -21 + 91 Combine like terms: -91 + 91 = 0 0 + 7c = -21 + 91 7c = -21 + 91 Combine like terms: -21 + 91 = 70 7c = 70 Divide each side by '7'. c = 10 Simplifying c = 10
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