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Simplifying 7(d + 4) = 4(d + -7) + 3d Reorder the terms: 7(4 + d) = 4(d + -7) + 3d (4 * 7 + d * 7) = 4(d + -7) + 3d (28 + 7d) = 4(d + -7) + 3d Reorder the terms: 28 + 7d = 4(-7 + d) + 3d 28 + 7d = (-7 * 4 + d * 4) + 3d 28 + 7d = (-28 + 4d) + 3d Combine like terms: 4d + 3d = 7d 28 + 7d = -28 + 7d Add '-7d' to each side of the equation. 28 + 7d + -7d = -28 + 7d + -7d Combine like terms: 7d + -7d = 0 28 + 0 = -28 + 7d + -7d 28 = -28 + 7d + -7d Combine like terms: 7d + -7d = 0 28 = -28 + 0 28 = -28 Solving 28 = -28 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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