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Simplifying -21 + 9t = 3t + -21 + 6t Reorder the terms: -21 + 9t = -21 + 3t + 6t Combine like terms: 3t + 6t = 9t -21 + 9t = -21 + 9t Add '21' to each side of the equation. -21 + 21 + 9t = -21 + 21 + 9t Combine like terms: -21 + 21 = 0 0 + 9t = -21 + 21 + 9t 9t = -21 + 21 + 9t Combine like terms: -21 + 21 = 0 9t = 0 + 9t 9t = 9t Add '-9t' to each side of the equation. 9t + -9t = 9t + -9t Combine like terms: 9t + -9t = 0 0 = 9t + -9t Combine like terms: 9t + -9t = 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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