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Simplifying -199 = 6(6 + 4r) + 7r -199 = (6 * 6 + 4r * 6) + 7r -199 = (36 + 24r) + 7r Combine like terms: 24r + 7r = 31r -199 = 36 + 31r Solving -199 = 36 + 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. -199 + -31r = 36 + 31r + -31r Combine like terms: 31r + -31r = 0 -199 + -31r = 36 + 0 -199 + -31r = 36 Add '199' to each side of the equation. -199 + 199 + -31r = 36 + 199 Combine like terms: -199 + 199 = 0 0 + -31r = 36 + 199 -31r = 36 + 199 Combine like terms: 36 + 199 = 235 -31r = 235 Divide each side by '-31'. r = -7.580645161 Simplifying r = -7.580645161
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