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Simplifying -12d + -15 = -3(d + 5) + -9d Reorder the terms: -15 + -12d = -3(d + 5) + -9d Reorder the terms: -15 + -12d = -3(5 + d) + -9d -15 + -12d = (5 * -3 + d * -3) + -9d -15 + -12d = (-15 + -3d) + -9d Combine like terms: -3d + -9d = -12d -15 + -12d = -15 + -12d Add '15' to each side of the equation. -15 + 15 + -12d = -15 + 15 + -12d Combine like terms: -15 + 15 = 0 0 + -12d = -15 + 15 + -12d -12d = -15 + 15 + -12d Combine like terms: -15 + 15 = 0 -12d = 0 + -12d -12d = -12d Add '12d' to each side of the equation. -12d + 12d = -12d + 12d Combine like terms: -12d + 12d = 0 0 = -12d + 12d Combine like terms: -12d + 12d = 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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