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Simplifying -66 = -4c + 2(6c + -9) Reorder the terms: -66 = -4c + 2(-9 + 6c) -66 = -4c + (-9 * 2 + 6c * 2) -66 = -4c + (-18 + 12c) Reorder the terms: -66 = -18 + -4c + 12c Combine like terms: -4c + 12c = 8c -66 = -18 + 8c Solving -66 = -18 + 8c Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-8c' to each side of the equation. -66 + -8c = -18 + 8c + -8c Combine like terms: 8c + -8c = 0 -66 + -8c = -18 + 0 -66 + -8c = -18 Add '66' to each side of the equation. -66 + 66 + -8c = -18 + 66 Combine like terms: -66 + 66 = 0 0 + -8c = -18 + 66 -8c = -18 + 66 Combine like terms: -18 + 66 = 48 -8c = 48 Divide each side by '-8'. c = -6 Simplifying c = -6
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