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Simplifying 3c + -11d + -1(5c + -21d) = 0 3c + -11d + (5c * -1 + -21d * -1) = 0 3c + -11d + (-5c + 21d) = 0 Reorder the terms: 3c + -5c + -11d + 21d = 0 Combine like terms: 3c + -5c = -2c -2c + -11d + 21d = 0 Combine like terms: -11d + 21d = 10d -2c + 10d = 0 Solving -2c + 10d = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-10d' to each side of the equation. -2c + 10d + -10d = 0 + -10d Combine like terms: 10d + -10d = 0 -2c + 0 = 0 + -10d -2c = 0 + -10d Remove the zero: -2c = -10d Divide each side by '-2'. c = 5d Simplifying c = 5d
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