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