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Simplifying R2 + 4r = 21 Solving R2 + 4r = 21 Solving for variable 'R'. Move all terms containing R to the left, all other terms to the right. Add '-4r' to each side of the equation. R2 + 4r + -4r = 21 + -4r Combine like terms: 4r + -4r = 0 R2 + 0 = 21 + -4r R2 = 21 + -4r Simplifying R2 = 21 + -4r Reorder the terms: -21 + R2 + 4r = 21 + -4r + -21 + 4r Reorder the terms: -21 + R2 + 4r = 21 + -21 + -4r + 4r Combine like terms: 21 + -21 = 0 -21 + R2 + 4r = 0 + -4r + 4r -21 + R2 + 4r = -4r + 4r Combine like terms: -4r + 4r = 0 -21 + R2 + 4r = 0 The solution to this equation could not be determined.
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