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Simplifying -13d + -21 = -3(d + 7) + -10d Reorder the terms: -21 + -13d = -3(d + 7) + -10d Reorder the terms: -21 + -13d = -3(7 + d) + -10d -21 + -13d = (7 * -3 + d * -3) + -10d -21 + -13d = (-21 + -3d) + -10d Combine like terms: -3d + -10d = -13d -21 + -13d = -21 + -13d Add '21' to each side of the equation. -21 + 21 + -13d = -21 + 21 + -13d Combine like terms: -21 + 21 = 0 0 + -13d = -21 + 21 + -13d -13d = -21 + 21 + -13d Combine like terms: -21 + 21 = 0 -13d = 0 + -13d -13d = -13d Add '13d' to each side of the equation. -13d + 13d = -13d + 13d Combine like terms: -13d + 13d = 0 0 = -13d + 13d Combine like terms: -13d + 13d = 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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