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Simplifying 9r + 3(9 + -7r) = 0 9r + (9 * 3 + -7r * 3) = 0 9r + (27 + -21r) = 0 Reorder the terms: 27 + 9r + -21r = 0 Combine like terms: 9r + -21r = -12r 27 + -12r = 0 Solving 27 + -12r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-27' to each side of the equation. 27 + -27 + -12r = 0 + -27 Combine like terms: 27 + -27 = 0 0 + -12r = 0 + -27 -12r = 0 + -27 Combine like terms: 0 + -27 = -27 -12r = -27 Divide each side by '-12'. r = 2.25 Simplifying r = 2.25
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