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