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Simplifying -7d + -15 = -3(d + 5) + -4d Reorder the terms: -15 + -7d = -3(d + 5) + -4d Reorder the terms: -15 + -7d = -3(5 + d) + -4d -15 + -7d = (5 * -3 + d * -3) + -4d -15 + -7d = (-15 + -3d) + -4d Combine like terms: -3d + -4d = -7d -15 + -7d = -15 + -7d Add '15' to each side of the equation. -15 + 15 + -7d = -15 + 15 + -7d Combine like terms: -15 + 15 = 0 0 + -7d = -15 + 15 + -7d -7d = -15 + 15 + -7d Combine like terms: -15 + 15 = 0 -7d = 0 + -7d -7d = -7d Add '7d' to each side of the equation. -7d + 7d = -7d + 7d Combine like terms: -7d + 7d = 0 0 = -7d + 7d Combine like terms: -7d + 7d = 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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