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Simplifying 7(d + 9) = 7(d + -4) Reorder the terms: 7(9 + d) = 7(d + -4) (9 * 7 + d * 7) = 7(d + -4) (63 + 7d) = 7(d + -4) Reorder the terms: 63 + 7d = 7(-4 + d) 63 + 7d = (-4 * 7 + d * 7) 63 + 7d = (-28 + 7d) Add '-7d' to each side of the equation. 63 + 7d + -7d = -28 + 7d + -7d Combine like terms: 7d + -7d = 0 63 + 0 = -28 + 7d + -7d 63 = -28 + 7d + -7d Combine like terms: 7d + -7d = 0 63 = -28 + 0 63 = -28 Solving 63 = -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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