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Simplifying 7(r + -5) + 9 = 72 Reorder the terms: 7(-5 + r) + 9 = 72 (-5 * 7 + r * 7) + 9 = 72 (-35 + 7r) + 9 = 72 Reorder the terms: -35 + 9 + 7r = 72 Combine like terms: -35 + 9 = -26 -26 + 7r = 72 Solving -26 + 7r = 72 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '26' to each side of the equation. -26 + 26 + 7r = 72 + 26 Combine like terms: -26 + 26 = 0 0 + 7r = 72 + 26 7r = 72 + 26 Combine like terms: 72 + 26 = 98 7r = 98 Divide each side by '7'. r = 14 Simplifying r = 14
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