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Simplifying 13 = 4(6r + -9) Reorder the terms: 13 = 4(-9 + 6r) 13 = (-9 * 4 + 6r * 4) 13 = (-36 + 24r) Solving 13 = -36 + 24r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-24r' to each side of the equation. 13 + -24r = -36 + 24r + -24r Combine like terms: 24r + -24r = 0 13 + -24r = -36 + 0 13 + -24r = -36 Add '-13' to each side of the equation. 13 + -13 + -24r = -36 + -13 Combine like terms: 13 + -13 = 0 0 + -24r = -36 + -13 -24r = -36 + -13 Combine like terms: -36 + -13 = -49 -24r = -49 Divide each side by '-24'. r = 2.041666667 Simplifying r = 2.041666667
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