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Simplifying 9 + r + 7r = 4(3 + 2r) + -3 Combine like terms: r + 7r = 8r 9 + 8r = 4(3 + 2r) + -3 9 + 8r = (3 * 4 + 2r * 4) + -3 9 + 8r = (12 + 8r) + -3 Reorder the terms: 9 + 8r = 12 + -3 + 8r Combine like terms: 12 + -3 = 9 9 + 8r = 9 + 8r Add '-9' to each side of the equation. 9 + -9 + 8r = 9 + -9 + 8r Combine like terms: 9 + -9 = 0 0 + 8r = 9 + -9 + 8r 8r = 9 + -9 + 8r Combine like terms: 9 + -9 = 0 8r = 0 + 8r 8r = 8r Add '-8r' to each side of the equation. 8r + -8r = 8r + -8r Combine like terms: 8r + -8r = 0 0 = 8r + -8r Combine like terms: 8r + -8r = 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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