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Simplifying R + 4 + 2r = -21 Reorder the terms: 4 + R + 2r = -21 Solving 4 + R + 2r = -21 Solving for variable 'R'. Move all terms containing R to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + R + -4 + 2r = -21 + -4 Reorder the terms: 4 + -4 + R + 2r = -21 + -4 Combine like terms: 4 + -4 = 0 0 + R + 2r = -21 + -4 R + 2r = -21 + -4 Combine like terms: -21 + -4 = -25 R + 2r = -25 Add '-2r' to each side of the equation. R + 2r + -2r = -25 + -2r Combine like terms: 2r + -2r = 0 R + 0 = -25 + -2r R = -25 + -2r Simplifying R = -25 + -2r
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