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Simplifying r + 7 = r + 7 Reorder the terms: 7 + r = r + 7 Reorder the terms: 7 + r = 7 + r Add '-7' to each side of the equation. 7 + -7 + r = 7 + -7 + r Combine like terms: 7 + -7 = 0 0 + r = 7 + -7 + r r = 7 + -7 + r Combine like terms: 7 + -7 = 0 r = 0 + r r = r Add '-1r' to each side of the equation. r + -1r = r + -1r Combine like terms: r + -1r = 0 0 = r + -1r Combine like terms: r + -1r = 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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