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Simplifying 9r + 4 = 4 + 9r Reorder the terms: 4 + 9r = 4 + 9r Add '-4' to each side of the equation. 4 + -4 + 9r = 4 + -4 + 9r Combine like terms: 4 + -4 = 0 0 + 9r = 4 + -4 + 9r 9r = 4 + -4 + 9r Combine like terms: 4 + -4 = 0 9r = 0 + 9r 9r = 9r Add '-9r' to each side of the equation. 9r + -9r = 9r + -9r Combine like terms: 9r + -9r = 0 0 = 9r + -9r Combine like terms: 9r + -9r = 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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