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Simplifying 2r + -21 = 27 + 8r Reorder the terms: -21 + 2r = 27 + 8r Solving -21 + 2r = 27 + 8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8r' to each side of the equation. -21 + 2r + -8r = 27 + 8r + -8r Combine like terms: 2r + -8r = -6r -21 + -6r = 27 + 8r + -8r Combine like terms: 8r + -8r = 0 -21 + -6r = 27 + 0 -21 + -6r = 27 Add '21' to each side of the equation. -21 + 21 + -6r = 27 + 21 Combine like terms: -21 + 21 = 0 0 + -6r = 27 + 21 -6r = 27 + 21 Combine like terms: 27 + 21 = 48 -6r = 48 Divide each side by '-6'. r = -8 Simplifying r = -8
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