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Simplifying -3(1 + 6r) = 15 + r (1 * -3 + 6r * -3) = 15 + r (-3 + -18r) = 15 + r Solving -3 + -18r = 15 + 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. -3 + -18r + -1r = 15 + r + -1r Combine like terms: -18r + -1r = -19r -3 + -19r = 15 + r + -1r Combine like terms: r + -1r = 0 -3 + -19r = 15 + 0 -3 + -19r = 15 Add '3' to each side of the equation. -3 + 3 + -19r = 15 + 3 Combine like terms: -3 + 3 = 0 0 + -19r = 15 + 3 -19r = 15 + 3 Combine like terms: 15 + 3 = 18 -19r = 18 Divide each side by '-19'. r = -0.9473684211 Simplifying r = -0.9473684211
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