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Simplifying -9d + -28 = -4(d + 7) + -5d Reorder the terms: -28 + -9d = -4(d + 7) + -5d Reorder the terms: -28 + -9d = -4(7 + d) + -5d -28 + -9d = (7 * -4 + d * -4) + -5d -28 + -9d = (-28 + -4d) + -5d Combine like terms: -4d + -5d = -9d -28 + -9d = -28 + -9d Add '28' to each side of the equation. -28 + 28 + -9d = -28 + 28 + -9d Combine like terms: -28 + 28 = 0 0 + -9d = -28 + 28 + -9d -9d = -28 + 28 + -9d Combine like terms: -28 + 28 = 0 -9d = 0 + -9d -9d = -9d Add '9d' to each side of the equation. -9d + 9d = -9d + 9d Combine like terms: -9d + 9d = 0 0 = -9d + 9d Combine like terms: -9d + 9d = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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