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Simplifying 3(3 + -1r) = 1 + -15r (3 * 3 + -1r * 3) = 1 + -15r (9 + -3r) = 1 + -15r Solving 9 + -3r = 1 + -15r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '15r' to each side of the equation. 9 + -3r + 15r = 1 + -15r + 15r Combine like terms: -3r + 15r = 12r 9 + 12r = 1 + -15r + 15r Combine like terms: -15r + 15r = 0 9 + 12r = 1 + 0 9 + 12r = 1 Add '-9' to each side of the equation. 9 + -9 + 12r = 1 + -9 Combine like terms: 9 + -9 = 0 0 + 12r = 1 + -9 12r = 1 + -9 Combine like terms: 1 + -9 = -8 12r = -8 Divide each side by '12'. r = -0.6666666667 Simplifying r = -0.6666666667
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