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Simplifying -1(9 + -7c) = -9 + 7c (9 * -1 + -7c * -1) = -9 + 7c (-9 + 7c) = -9 + 7c Add '9' to each side of the equation. -9 + 9 + 7c = -9 + 9 + 7c Combine like terms: -9 + 9 = 0 0 + 7c = -9 + 9 + 7c 7c = -9 + 9 + 7c Combine like terms: -9 + 9 = 0 7c = 0 + 7c 7c = 7c Add '-7c' to each side of the equation. 7c + -7c = 7c + -7c Combine like terms: 7c + -7c = 0 0 = 7c + -7c Combine like terms: 7c + -7c = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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