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Simplifying -1(c + -7) = -81 Reorder the terms: -1(-7 + c) = -81 (-7 * -1 + c * -1) = -81 (7 + -1c) = -81 Solving 7 + -1c = -81 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1c = -81 + -7 Combine like terms: 7 + -7 = 0 0 + -1c = -81 + -7 -1c = -81 + -7 Combine like terms: -81 + -7 = -88 -1c = -88 Divide each side by '-1'. c = 88 Simplifying c = 88
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