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Simplifying 1 + -4r + 8 + 2r = 15 Reorder the terms: 1 + 8 + -4r + 2r = 15 Combine like terms: 1 + 8 = 9 9 + -4r + 2r = 15 Combine like terms: -4r + 2r = -2r 9 + -2r = 15 Solving 9 + -2r = 15 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -2r = 15 + -9 Combine like terms: 9 + -9 = 0 0 + -2r = 15 + -9 -2r = 15 + -9 Combine like terms: 15 + -9 = 6 -2r = 6 Divide each side by '-2'. r = -3 Simplifying r = -3
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