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Simplifying -13r + -20 + -7r = -10 + 20 Reorder the terms: -20 + -13r + -7r = -10 + 20 Combine like terms: -13r + -7r = -20r -20 + -20r = -10 + 20 Combine like terms: -10 + 20 = 10 -20 + -20r = 10 Solving -20 + -20r = 10 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + -20r = 10 + 20 Combine like terms: -20 + 20 = 0 0 + -20r = 10 + 20 -20r = 10 + 20 Combine like terms: 10 + 20 = 30 -20r = 30 Divide each side by '-20'. r = -1.5 Simplifying r = -1.5
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