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Simplifying 14 + 7r + 2r + -9 = 15r + 12 + -6r + -7 Reorder the terms: 14 + -9 + 7r + 2r = 15r + 12 + -6r + -7 Combine like terms: 14 + -9 = 5 5 + 7r + 2r = 15r + 12 + -6r + -7 Combine like terms: 7r + 2r = 9r 5 + 9r = 15r + 12 + -6r + -7 Reorder the terms: 5 + 9r = 12 + -7 + 15r + -6r Combine like terms: 12 + -7 = 5 5 + 9r = 5 + 15r + -6r Combine like terms: 15r + -6r = 9r 5 + 9r = 5 + 9r Add '-5' to each side of the equation. 5 + -5 + 9r = 5 + -5 + 9r Combine like terms: 5 + -5 = 0 0 + 9r = 5 + -5 + 9r 9r = 5 + -5 + 9r Combine like terms: 5 + -5 = 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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