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Simplifying 21 = 1 + 4c Solving 21 = 1 + 4c Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-4c' to each side of the equation. 21 + -4c = 1 + 4c + -4c Combine like terms: 4c + -4c = 0 21 + -4c = 1 + 0 21 + -4c = 1 Add '-21' to each side of the equation. 21 + -21 + -4c = 1 + -21 Combine like terms: 21 + -21 = 0 0 + -4c = 1 + -21 -4c = 1 + -21 Combine like terms: 1 + -21 = -20 -4c = -20 Divide each side by '-4'. c = 5 Simplifying c = 5
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