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Simplifying 21(3c + 1) + -4 = 13 Reorder the terms: 21(1 + 3c) + -4 = 13 (1 * 21 + 3c * 21) + -4 = 13 (21 + 63c) + -4 = 13 Reorder the terms: 21 + -4 + 63c = 13 Combine like terms: 21 + -4 = 17 17 + 63c = 13 Solving 17 + 63c = 13 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-17' to each side of the equation. 17 + -17 + 63c = 13 + -17 Combine like terms: 17 + -17 = 0 0 + 63c = 13 + -17 63c = 13 + -17 Combine like terms: 13 + -17 = -4 63c = -4 Divide each side by '63'. c = -0.06349206349 Simplifying c = -0.06349206349
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