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Simplifying 21r + -26 = 8r + -13 Reorder the terms: -26 + 21r = 8r + -13 Reorder the terms: -26 + 21r = -13 + 8r Solving -26 + 21r = -13 + 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. -26 + 21r + -8r = -13 + 8r + -8r Combine like terms: 21r + -8r = 13r -26 + 13r = -13 + 8r + -8r Combine like terms: 8r + -8r = 0 -26 + 13r = -13 + 0 -26 + 13r = -13 Add '26' to each side of the equation. -26 + 26 + 13r = -13 + 26 Combine like terms: -26 + 26 = 0 0 + 13r = -13 + 26 13r = -13 + 26 Combine like terms: -13 + 26 = 13 13r = 13 Divide each side by '13'. r = 1 Simplifying r = 1
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