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Simplifying 13r + 7r + (-3r) + (-7r) + 5r = (-15) Combine like terms: 13r + 7r = 20r 20r + (-3r) + (-7r) + 5r = (-15) Combine like terms: 20r + (-3r) = 17r 17r + (-7r) + 5r = (-15) Combine like terms: 17r + (-7r) = 10r 10r + 5r = (-15) Combine like terms: 10r + 5r = 15r 15r = (-15) 15r = -15 Solving 15r = -15 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Divide each side by '15'. r = -1 Simplifying r = -1
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