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Simplifying 15 = -4(5k + -2) + 4(1 + 5k) Reorder the terms: 15 = -4(-2 + 5k) + 4(1 + 5k) 15 = (-2 * -4 + 5k * -4) + 4(1 + 5k) 15 = (8 + -20k) + 4(1 + 5k) 15 = 8 + -20k + (1 * 4 + 5k * 4) 15 = 8 + -20k + (4 + 20k) Reorder the terms: 15 = 8 + 4 + -20k + 20k Combine like terms: 8 + 4 = 12 15 = 12 + -20k + 20k Combine like terms: -20k + 20k = 0 15 = 12 + 0 15 = 12 Solving 15 = 12 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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