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Simplifying 13 + -20 = 9R Combine like terms: 13 + -20 = -7 -7 = 9R Solving -7 = 9R Solving for variable 'R'. Move all terms containing R to the left, all other terms to the right. Add '-9R' to each side of the equation. -7 + -9R = 9R + -9R Combine like terms: 9R + -9R = 0 -7 + -9R = 0 Add '7' to each side of the equation. -7 + 7 + -9R = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -9R = 0 + 7 -9R = 0 + 7 Combine like terms: 0 + 7 = 7 -9R = 7 Divide each side by '-9'. R = -0.7777777778 Simplifying R = -0.7777777778
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