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Simplifying 1 + (8r + 9) = (2 + 8) + 8r Reorder the terms: 1 + (9 + 8r) = (2 + 8) + 8r Remove parenthesis around (9 + 8r) 1 + 9 + 8r = (2 + 8) + 8r Combine like terms: 1 + 9 = 10 10 + 8r = (2 + 8) + 8r Combine like terms: 2 + 8 = 10 10 + 8r = (10) + 8r 10 + 8r = 10 + 8r Add '-10' to each side of the equation. 10 + -10 + 8r = 10 + -10 + 8r Combine like terms: 10 + -10 = 0 0 + 8r = 10 + -10 + 8r 8r = 10 + -10 + 8r Combine like terms: 10 + -10 = 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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