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Simplifying 99 = -3(5r + -3) Reorder the terms: 99 = -3(-3 + 5r) 99 = (-3 * -3 + 5r * -3) 99 = (9 + -15r) Solving 99 = 9 + -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. 99 + 15r = 9 + -15r + 15r Combine like terms: -15r + 15r = 0 99 + 15r = 9 + 0 99 + 15r = 9 Add '-99' to each side of the equation. 99 + -99 + 15r = 9 + -99 Combine like terms: 99 + -99 = 0 0 + 15r = 9 + -99 15r = 9 + -99 Combine like terms: 9 + -99 = -90 15r = -90 Divide each side by '15'. r = -6 Simplifying r = -6
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