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Simplifying -6 + -5(1 + -7r) = 20 -6 + (1 * -5 + -7r * -5) = 20 -6 + (-5 + 35r) = 20 Combine like terms: -6 + -5 = -11 -11 + 35r = 20 Solving -11 + 35r = 20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + 35r = 20 + 11 Combine like terms: -11 + 11 = 0 0 + 35r = 20 + 11 35r = 20 + 11 Combine like terms: 20 + 11 = 31 35r = 31 Divide each side by '35'. r = 0.8857142857 Simplifying r = 0.8857142857
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