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Simplifying 7(c + 3) = 20 + 7c Reorder the terms: 7(3 + c) = 20 + 7c (3 * 7 + c * 7) = 20 + 7c (21 + 7c) = 20 + 7c Add '-7c' to each side of the equation. 21 + 7c + -7c = 20 + 7c + -7c Combine like terms: 7c + -7c = 0 21 + 0 = 20 + 7c + -7c 21 = 20 + 7c + -7c Combine like terms: 7c + -7c = 0 21 = 20 + 0 21 = 20 Solving 21 = 20 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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