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Simplifying r2 + 20 + c = 0 Reorder the terms: 20 + c + r2 = 0 Solving 20 + c + r2 = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + c + -20 + r2 = 0 + -20 Reorder the terms: 20 + -20 + c + r2 = 0 + -20 Combine like terms: 20 + -20 = 0 0 + c + r2 = 0 + -20 c + r2 = 0 + -20 Combine like terms: 0 + -20 = -20 c + r2 = -20 Add '-1r2' to each side of the equation. c + r2 + -1r2 = -20 + -1r2 Combine like terms: r2 + -1r2 = 0 c + 0 = -20 + -1r2 c = -20 + -1r2 Simplifying c = -20 + -1r2
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