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Simplifying 9c + 4d + -4(7c + -6d) = 0 9c + 4d + (7c * -4 + -6d * -4) = 0 9c + 4d + (-28c + 24d) = 0 Reorder the terms: 9c + -28c + 4d + 24d = 0 Combine like terms: 9c + -28c = -19c -19c + 4d + 24d = 0 Combine like terms: 4d + 24d = 28d -19c + 28d = 0 Solving -19c + 28d = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-28d' to each side of the equation. -19c + 28d + -28d = 0 + -28d Combine like terms: 28d + -28d = 0 -19c + 0 = 0 + -28d -19c = 0 + -28d Remove the zero: -19c = -28d Divide each side by '-19'. c = 1.473684211d Simplifying c = 1.473684211d
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