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Simplifying -5r + 4 + 13r = -7 Reorder the terms: 4 + -5r + 13r = -7 Combine like terms: -5r + 13r = 8r 4 + 8r = -7 Solving 4 + 8r = -7 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 + 8r = -7 + -4 Combine like terms: 4 + -4 = 0 0 + 8r = -7 + -4 8r = -7 + -4 Combine like terms: -7 + -4 = -11 8r = -11 Divide each side by '8'. r = -1.375 Simplifying r = -1.375
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