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Simplifying 7d + 19 = 7d + -21 Reorder the terms: 19 + 7d = 7d + -21 Reorder the terms: 19 + 7d = -21 + 7d Add '-7d' to each side of the equation. 19 + 7d + -7d = -21 + 7d + -7d Combine like terms: 7d + -7d = 0 19 + 0 = -21 + 7d + -7d 19 = -21 + 7d + -7d Combine like terms: 7d + -7d = 0 19 = -21 + 0 19 = -21 Solving 19 = -21 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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