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Simplifying -4(5 + 8r) = r (5 * -4 + 8r * -4) = r (-20 + -32r) = r Solving -20 + -32r = r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. -20 + -32r + -1r = r + -1r Combine like terms: -32r + -1r = -33r -20 + -33r = r + -1r Combine like terms: r + -1r = 0 -20 + -33r = 0 Add '20' to each side of the equation. -20 + 20 + -33r = 0 + 20 Combine like terms: -20 + 20 = 0 0 + -33r = 0 + 20 -33r = 0 + 20 Combine like terms: 0 + 20 = 20 -33r = 20 Divide each side by '-33'. r = -0.6060606061 Simplifying r = -0.6060606061
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