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Simplifying 7c + 4d = -21 Solving 7c + 4d = -21 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-4d' to each side of the equation. 7c + 4d + -4d = -21 + -4d Combine like terms: 4d + -4d = 0 7c + 0 = -21 + -4d 7c = -21 + -4d Divide each side by '7'. c = -3 + -0.5714285714d Simplifying c = -3 + -0.5714285714d
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