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Simplifying 7(-1c + -20) + 13c = 7c Reorder the terms: 7(-20 + -1c) + 13c = 7c (-20 * 7 + -1c * 7) + 13c = 7c (-140 + -7c) + 13c = 7c Combine like terms: -7c + 13c = 6c -140 + 6c = 7c Solving -140 + 6c = 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. -140 + 6c + -7c = 7c + -7c Combine like terms: 6c + -7c = -1c -140 + -1c = 7c + -7c Combine like terms: 7c + -7c = 0 -140 + -1c = 0 Add '140' to each side of the equation. -140 + 140 + -1c = 0 + 140 Combine like terms: -140 + 140 = 0 0 + -1c = 0 + 140 -1c = 0 + 140 Combine like terms: 0 + 140 = 140 -1c = 140 Divide each side by '-1'. c = -140 Simplifying c = -140
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