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Simplifying (2r + 4) = 2r + 4 Reorder the terms: (4 + 2r) = 2r + 4 Remove parenthesis around (4 + 2r) 4 + 2r = 2r + 4 Reorder the terms: 4 + 2r = 4 + 2r Add '-4' to each side of the equation. 4 + -4 + 2r = 4 + -4 + 2r Combine like terms: 4 + -4 = 0 0 + 2r = 4 + -4 + 2r 2r = 4 + -4 + 2r Combine like terms: 4 + -4 = 0 2r = 0 + 2r 2r = 2r Add '-2r' to each side of the equation. 2r + -2r = 2r + -2r Combine like terms: 2r + -2r = 0 0 = 2r + -2r Combine like terms: 2r + -2r = 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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