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Simplifying -5 = 4(2 + 9r) + -5r -5 = (2 * 4 + 9r * 4) + -5r -5 = (8 + 36r) + -5r Combine like terms: 36r + -5r = 31r -5 = 8 + 31r Solving -5 = 8 + 31r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-31r' to each side of the equation. -5 + -31r = 8 + 31r + -31r Combine like terms: 31r + -31r = 0 -5 + -31r = 8 + 0 -5 + -31r = 8 Add '5' to each side of the equation. -5 + 5 + -31r = 8 + 5 Combine like terms: -5 + 5 = 0 0 + -31r = 8 + 5 -31r = 8 + 5 Combine like terms: 8 + 5 = 13 -31r = 13 Divide each side by '-31'. r = -0.4193548387 Simplifying r = -0.4193548387
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