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Simplifying -20C = -4C + 4(-4C + 16) Reorder the terms: -20C = -4C + 4(16 + -4C) -20C = -4C + (16 * 4 + -4C * 4) -20C = -4C + (64 + -16C) Reorder the terms: -20C = 64 + -4C + -16C Combine like terms: -4C + -16C = -20C -20C = 64 + -20C Add '20C' to each side of the equation. -20C + 20C = 64 + -20C + 20C Combine like terms: -20C + 20C = 0 0 = 64 + -20C + 20C Combine like terms: -20C + 20C = 0 0 = 64 + 0 0 = 64 Solving 0 = 64 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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