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Simplifying -1(d + 7) + 4d + -7 = 3d + -7 Reorder the terms: -1(7 + d) + 4d + -7 = 3d + -7 (7 * -1 + d * -1) + 4d + -7 = 3d + -7 (-7 + -1d) + 4d + -7 = 3d + -7 Reorder the terms: -7 + -7 + -1d + 4d = 3d + -7 Combine like terms: -7 + -7 = -14 -14 + -1d + 4d = 3d + -7 Combine like terms: -1d + 4d = 3d -14 + 3d = 3d + -7 Reorder the terms: -14 + 3d = -7 + 3d Add '-3d' to each side of the equation. -14 + 3d + -3d = -7 + 3d + -3d Combine like terms: 3d + -3d = 0 -14 + 0 = -7 + 3d + -3d -14 = -7 + 3d + -3d Combine like terms: 3d + -3d = 0 -14 = -7 + 0 -14 = -7 Solving -14 = -7 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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