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Simplifying 15 = -2(2r + -1) Reorder the terms: 15 = -2(-1 + 2r) 15 = (-1 * -2 + 2r * -2) 15 = (2 + -4r) Solving 15 = 2 + -4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4r' to each side of the equation. 15 + 4r = 2 + -4r + 4r Combine like terms: -4r + 4r = 0 15 + 4r = 2 + 0 15 + 4r = 2 Add '-15' to each side of the equation. 15 + -15 + 4r = 2 + -15 Combine like terms: 15 + -15 = 0 0 + 4r = 2 + -15 4r = 2 + -15 Combine like terms: 2 + -15 = -13 4r = -13 Divide each side by '4'. r = -3.25 Simplifying r = -3.25
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