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Simplifying 99 = 3(1 + -4r) 99 = (1 * 3 + -4r * 3) 99 = (3 + -12r) Solving 99 = 3 + -12r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12r' to each side of the equation. 99 + 12r = 3 + -12r + 12r Combine like terms: -12r + 12r = 0 99 + 12r = 3 + 0 99 + 12r = 3 Add '-99' to each side of the equation. 99 + -99 + 12r = 3 + -99 Combine like terms: 99 + -99 = 0 0 + 12r = 3 + -99 12r = 3 + -99 Combine like terms: 3 + -99 = -96 12r = -96 Divide each side by '12'. r = -8 Simplifying r = -8
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