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Simplifying 15 = -21 + 2c Solving 15 = -21 + 2c Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-2c' to each side of the equation. 15 + -2c = -21 + 2c + -2c Combine like terms: 2c + -2c = 0 15 + -2c = -21 + 0 15 + -2c = -21 Add '-15' to each side of the equation. 15 + -15 + -2c = -21 + -15 Combine like terms: 15 + -15 = 0 0 + -2c = -21 + -15 -2c = -21 + -15 Combine like terms: -21 + -15 = -36 -2c = -36 Divide each side by '-2'. c = 18 Simplifying c = 18
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