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Simplifying 15(d + 7) = 4(d + -4) + 11d Reorder the terms: 15(7 + d) = 4(d + -4) + 11d (7 * 15 + d * 15) = 4(d + -4) + 11d (105 + 15d) = 4(d + -4) + 11d Reorder the terms: 105 + 15d = 4(-4 + d) + 11d 105 + 15d = (-4 * 4 + d * 4) + 11d 105 + 15d = (-16 + 4d) + 11d Combine like terms: 4d + 11d = 15d 105 + 15d = -16 + 15d Add '-15d' to each side of the equation. 105 + 15d + -15d = -16 + 15d + -15d Combine like terms: 15d + -15d = 0 105 + 0 = -16 + 15d + -15d 105 = -16 + 15d + -15d Combine like terms: 15d + -15d = 0 105 = -16 + 0 105 = -16 Solving 105 = -16 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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