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Simplifying 3(d + 7) + -1d = 2(d + 10) Reorder the terms: 3(7 + d) + -1d = 2(d + 10) (7 * 3 + d * 3) + -1d = 2(d + 10) (21 + 3d) + -1d = 2(d + 10) Combine like terms: 3d + -1d = 2d 21 + 2d = 2(d + 10) Reorder the terms: 21 + 2d = 2(10 + d) 21 + 2d = (10 * 2 + d * 2) 21 + 2d = (20 + 2d) Add '-2d' to each side of the equation. 21 + 2d + -2d = 20 + 2d + -2d Combine like terms: 2d + -2d = 0 21 + 0 = 20 + 2d + -2d 21 = 20 + 2d + -2d Combine like terms: 2d + -2d = 0 21 = 20 + 0 21 = 20 Solving 21 = 20 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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