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Simplifying c + -2(c + -20) = 7c Reorder the terms: c + -2(-20 + c) = 7c c + (-20 * -2 + c * -2) = 7c c + (40 + -2c) = 7c Reorder the terms: 40 + c + -2c = 7c Combine like terms: c + -2c = -1c 40 + -1c = 7c Solving 40 + -1c = 7c Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-7c' to each side of the equation. 40 + -1c + -7c = 7c + -7c Combine like terms: -1c + -7c = -8c 40 + -8c = 7c + -7c Combine like terms: 7c + -7c = 0 40 + -8c = 0 Add '-40' to each side of the equation. 40 + -40 + -8c = 0 + -40 Combine like terms: 40 + -40 = 0 0 + -8c = 0 + -40 -8c = 0 + -40 Combine like terms: 0 + -40 = -40 -8c = -40 Divide each side by '-8'. c = 5 Simplifying c = 5
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