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Simplifying 7 + 4 = 9r + 8 + -1r Combine like terms: 7 + 4 = 11 11 = 9r + 8 + -1r Reorder the terms: 11 = 8 + 9r + -1r Combine like terms: 9r + -1r = 8r 11 = 8 + 8r Solving 11 = 8 + 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. 11 + -8r = 8 + 8r + -8r Combine like terms: 8r + -8r = 0 11 + -8r = 8 + 0 11 + -8r = 8 Add '-11' to each side of the equation. 11 + -11 + -8r = 8 + -11 Combine like terms: 11 + -11 = 0 0 + -8r = 8 + -11 -8r = 8 + -11 Combine like terms: 8 + -11 = -3 -8r = -3 Divide each side by '-8'. r = 0.375 Simplifying r = 0.375
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