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Simplifying 21 + 7r + 7r + -15 = 16r + 16 + -2r + -10 Reorder the terms: 21 + -15 + 7r + 7r = 16r + 16 + -2r + -10 Combine like terms: 21 + -15 = 6 6 + 7r + 7r = 16r + 16 + -2r + -10 Combine like terms: 7r + 7r = 14r 6 + 14r = 16r + 16 + -2r + -10 Reorder the terms: 6 + 14r = 16 + -10 + 16r + -2r Combine like terms: 16 + -10 = 6 6 + 14r = 6 + 16r + -2r Combine like terms: 16r + -2r = 14r 6 + 14r = 6 + 14r Add '-6' to each side of the equation. 6 + -6 + 14r = 6 + -6 + 14r Combine like terms: 6 + -6 = 0 0 + 14r = 6 + -6 + 14r 14r = 6 + -6 + 14r Combine like terms: 6 + -6 = 0 14r = 0 + 14r 14r = 14r Add '-14r' to each side of the equation. 14r + -14r = 14r + -14r Combine like terms: 14r + -14r = 0 0 = 14r + -14r Combine like terms: 14r + -14r = 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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