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Simplifying 8c + -20 = 21c + -7 Reorder the terms: -20 + 8c = 21c + -7 Reorder the terms: -20 + 8c = -7 + 21c Solving -20 + 8c = -7 + 21c Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-21c' to each side of the equation. -20 + 8c + -21c = -7 + 21c + -21c Combine like terms: 8c + -21c = -13c -20 + -13c = -7 + 21c + -21c Combine like terms: 21c + -21c = 0 -20 + -13c = -7 + 0 -20 + -13c = -7 Add '20' to each side of the equation. -20 + 20 + -13c = -7 + 20 Combine like terms: -20 + 20 = 0 0 + -13c = -7 + 20 -13c = -7 + 20 Combine like terms: -7 + 20 = 13 -13c = 13 Divide each side by '-13'. c = -1 Simplifying c = -1
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