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Simplifying 9d + -1(4d + 12) = 5d + 8 Reorder the terms: 9d + -1(12 + 4d) = 5d + 8 9d + (12 * -1 + 4d * -1) = 5d + 8 9d + (-12 + -4d) = 5d + 8 Reorder the terms: -12 + 9d + -4d = 5d + 8 Combine like terms: 9d + -4d = 5d -12 + 5d = 5d + 8 Reorder the terms: -12 + 5d = 8 + 5d Add '-5d' to each side of the equation. -12 + 5d + -5d = 8 + 5d + -5d Combine like terms: 5d + -5d = 0 -12 + 0 = 8 + 5d + -5d -12 = 8 + 5d + -5d Combine like terms: 5d + -5d = 0 -12 = 8 + 0 -12 = 8 Solving -12 = 8 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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