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Simplifying 7c + -1d = 20 Solving 7c + -1d = 20 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add 'd' to each side of the equation. 7c + -1d + d = 20 + d Combine like terms: -1d + d = 0 7c + 0 = 20 + d 7c = 20 + d Divide each side by '7'. c = 2.857142857 + 0.1428571429d Simplifying c = 2.857142857 + 0.1428571429d
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