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Simplifying R + (2R) + (R + -4) = 28 Reorder the terms: R + (2R) + (-4 + R) = 28 Remove parenthesis around (-4 + R) R + (2R) + -4 + R = 28 Reorder the terms: -4 + R + (2R) + R = 28 Combine like terms: R + (2R) = 3R -4 + 3R + R = 28 Combine like terms: 3R + R = 4R -4 + 4R = 28 Solving -4 + 4R = 28 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 + 4 + 4R = 28 + 4 Combine like terms: -4 + 4 = 0 0 + 4R = 28 + 4 4R = 28 + 4 Combine like terms: 28 + 4 = 32 4R = 32 Divide each side by '4'. R = 8 Simplifying R = 8
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