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Simplifying 80[2r + 5] = 84 Reorder the terms: 80[5 + 2r] = 84 [5 * 80 + 2r * 80] = 84 [400 + 160r] = 84 Solving 400 + 160r = 84 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-400' to each side of the equation. 400 + -400 + 160r = 84 + -400 Combine like terms: 400 + -400 = 0 0 + 160r = 84 + -400 160r = 84 + -400 Combine like terms: 84 + -400 = -316 160r = -316 Divide each side by '160'. r = -1.975 Simplifying r = -1.975
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