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Simplifying 15r + 7(60 + -1r) = 0 15r + (60 * 7 + -1r * 7) = 0 15r + (420 + -7r) = 0 Reorder the terms: 420 + 15r + -7r = 0 Combine like terms: 15r + -7r = 8r 420 + 8r = 0 Solving 420 + 8r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-420' to each side of the equation. 420 + -420 + 8r = 0 + -420 Combine like terms: 420 + -420 = 0 0 + 8r = 0 + -420 8r = 0 + -420 Combine like terms: 0 + -420 = -420 8r = -420 Divide each side by '8'. r = -52.5 Simplifying r = -52.5
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