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Simplifying 1 + r + -4 + 4 = 1 + r Reorder the terms: 1 + -4 + 4 + r = 1 + r Combine like terms: 1 + -4 = -3 -3 + 4 + r = 1 + r Combine like terms: -3 + 4 = 1 1 + r = 1 + r Add '-1' to each side of the equation. 1 + -1 + r = 1 + -1 + r Combine like terms: 1 + -1 = 0 0 + r = 1 + -1 + r r = 1 + -1 + r Combine like terms: 1 + -1 = 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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