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Simplifying 8(9 + -1r) = 0 (9 * 8 + -1r * 8) = 0 (72 + -8r) = 0 Solving 72 + -8r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-72' to each side of the equation. 72 + -72 + -8r = 0 + -72 Combine like terms: 72 + -72 = 0 0 + -8r = 0 + -72 -8r = 0 + -72 Combine like terms: 0 + -72 = -72 -8r = -72 Divide each side by '-8'. r = 9 Simplifying r = 9
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