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Simplifying 8r + -5(6 + -7) = 18 + -5r Combine like terms: 6 + -7 = -1 8r + -5(-1) = 18 + -5r Multiply -5 * -1 8r + 5 = 18 + -5r Reorder the terms: 5 + 8r = 18 + -5r Solving 5 + 8r = 18 + -5r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '5r' to each side of the equation. 5 + 8r + 5r = 18 + -5r + 5r Combine like terms: 8r + 5r = 13r 5 + 13r = 18 + -5r + 5r Combine like terms: -5r + 5r = 0 5 + 13r = 18 + 0 5 + 13r = 18 Add '-5' to each side of the equation. 5 + -5 + 13r = 18 + -5 Combine like terms: 5 + -5 = 0 0 + 13r = 18 + -5 13r = 18 + -5 Combine like terms: 18 + -5 = 13 13r = 13 Divide each side by '13'. r = 1 Simplifying r = 1
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