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Simplifying -5r + 86 = -18 + 8r Reorder the terms: 86 + -5r = -18 + 8r Solving 86 + -5r = -18 + 8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8r' to each side of the equation. 86 + -5r + -8r = -18 + 8r + -8r Combine like terms: -5r + -8r = -13r 86 + -13r = -18 + 8r + -8r Combine like terms: 8r + -8r = 0 86 + -13r = -18 + 0 86 + -13r = -18 Add '-86' to each side of the equation. 86 + -86 + -13r = -18 + -86 Combine like terms: 86 + -86 = 0 0 + -13r = -18 + -86 -13r = -18 + -86 Combine like terms: -18 + -86 = -104 -13r = -104 Divide each side by '-13'. r = 8 Simplifying r = 8
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