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Simplifying -108 = -4(5r + -3) Reorder the terms: -108 = -4(-3 + 5r) -108 = (-3 * -4 + 5r * -4) -108 = (12 + -20r) Solving -108 = 12 + -20r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '20r' to each side of the equation. -108 + 20r = 12 + -20r + 20r Combine like terms: -20r + 20r = 0 -108 + 20r = 12 + 0 -108 + 20r = 12 Add '108' to each side of the equation. -108 + 108 + 20r = 12 + 108 Combine like terms: -108 + 108 = 0 0 + 20r = 12 + 108 20r = 12 + 108 Combine like terms: 12 + 108 = 120 20r = 120 Divide each side by '20'. r = 6 Simplifying r = 6
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