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Simplifying -3c + -1(-4c) + 1 = 21 Remove parenthesis around (-4c) -3c + -1 * -4c + 1 = 21 Multiply -1 * -4 -3c + 4c + 1 = 21 Reorder the terms: 1 + -3c + 4c = 21 Combine like terms: -3c + 4c = 1c 1 + 1c = 21 Solving 1 + 1c = 21 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 1c = 21 + -1 Combine like terms: 1 + -1 = 0 0 + 1c = 21 + -1 1c = 21 + -1 Combine like terms: 21 + -1 = 20 1c = 20 Divide each side by '1'. c = 20 Simplifying c = 20
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