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Simplifying 8 + 5r = (-1 + 8r) Remove parenthesis around (-1 + 8r) 8 + 5r = -1 + 8r Solving 8 + 5r = -1 + 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. 8 + 5r + -8r = -1 + 8r + -8r Combine like terms: 5r + -8r = -3r 8 + -3r = -1 + 8r + -8r Combine like terms: 8r + -8r = 0 8 + -3r = -1 + 0 8 + -3r = -1 Add '-8' to each side of the equation. 8 + -8 + -3r = -1 + -8 Combine like terms: 8 + -8 = 0 0 + -3r = -1 + -8 -3r = -1 + -8 Combine like terms: -1 + -8 = -9 -3r = -9 Divide each side by '-3'. r = 3 Simplifying r = 3
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