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Simplifying 8 + -1(-1r) = 17 Remove parenthesis around (-1r) 8 + -1 * -1r = 17 Multiply -1 * -1 8 + 1r = 17 Solving 8 + 1r = 17 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + 1r = 17 + -8 Combine like terms: 8 + -8 = 0 0 + 1r = 17 + -8 1r = 17 + -8 Combine like terms: 17 + -8 = 9 1r = 9 Divide each side by '1'. r = 9 Simplifying r = 9
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