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Simplifying 3(6 + -7c) = -31 (6 * 3 + -7c * 3) = -31 (18 + -21c) = -31 Solving 18 + -21c = -31 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + -21c = -31 + -18 Combine like terms: 18 + -18 = 0 0 + -21c = -31 + -18 -21c = -31 + -18 Combine like terms: -31 + -18 = -49 -21c = -49 Divide each side by '-21'. c = 2.333333333 Simplifying c = 2.333333333
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