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Simplifying 7 + 2r = 2r + 7 Reorder the terms: 7 + 2r = 7 + 2r Add '-7' to each side of the equation. 7 + -7 + 2r = 7 + -7 + 2r Combine like terms: 7 + -7 = 0 0 + 2r = 7 + -7 + 2r 2r = 7 + -7 + 2r Combine like terms: 7 + -7 = 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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