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Simplifying 7d + d + -4d + -7 = 4d Reorder the terms: -7 + 7d + d + -4d = 4d Combine like terms: 7d + d = 8d -7 + 8d + -4d = 4d Combine like terms: 8d + -4d = 4d -7 + 4d = 4d Add '-4d' to each side of the equation. -7 + 4d + -4d = 4d + -4d Combine like terms: 4d + -4d = 0 -7 + 0 = 4d + -4d -7 = 4d + -4d Combine like terms: 4d + -4d = 0 -7 = 0 Solving -7 = 0 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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