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Simplifying 21r + -6 = 21r + -6 Reorder the terms: -6 + 21r = 21r + -6 Reorder the terms: -6 + 21r = -6 + 21r Add '6' to each side of the equation. -6 + 6 + 21r = -6 + 6 + 21r Combine like terms: -6 + 6 = 0 0 + 21r = -6 + 6 + 21r 21r = -6 + 6 + 21r Combine like terms: -6 + 6 = 0 21r = 0 + 21r 21r = 21r Add '-21r' to each side of the equation. 21r + -21r = 21r + -21r Combine like terms: 21r + -21r = 0 0 = 21r + -21r Combine like terms: 21r + -21r = 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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