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