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Simplifying r + 34 = 21 Reorder the terms: 34 + r = 21 Solving 34 + r = 21 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-34' to each side of the equation. 34 + -34 + r = 21 + -34 Combine like terms: 34 + -34 = 0 0 + r = 21 + -34 r = 21 + -34 Combine like terms: 21 + -34 = -13 r = -13 Simplifying r = -13
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