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Simplifying 21 + r = -0.25 Solving 21 + r = -0.25 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + r = -0.25 + -21 Combine like terms: 21 + -21 = 0 0 + r = -0.25 + -21 r = -0.25 + -21 Combine like terms: -0.25 + -21 = -21.25 r = -21.25 Simplifying r = -21.25
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