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Simplifying -7(r + -9) = 0 Reorder the terms: -7(-9 + r) = 0 (-9 * -7 + r * -7) = 0 (63 + -7r) = 0 Solving 63 + -7r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-63' to each side of the equation. 63 + -63 + -7r = 0 + -63 Combine like terms: 63 + -63 = 0 0 + -7r = 0 + -63 -7r = 0 + -63 Combine like terms: 0 + -63 = -63 -7r = -63 Divide each side by '-7'. r = 9 Simplifying r = 9
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