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Simplifying 9 + 7(1 + 4r) = -26 9 + (1 * 7 + 4r * 7) = -26 9 + (7 + 28r) = -26 Combine like terms: 9 + 7 = 16 16 + 28r = -26 Solving 16 + 28r = -26 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-16' to each side of the equation. 16 + -16 + 28r = -26 + -16 Combine like terms: 16 + -16 = 0 0 + 28r = -26 + -16 28r = -26 + -16 Combine like terms: -26 + -16 = -42 28r = -42 Divide each side by '28'. r = -1.5 Simplifying r = -1.5
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