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Simplifying -1r + 3 + -1r = 15 Reorder the terms: 3 + -1r + -1r = 15 Combine like terms: -1r + -1r = -2r 3 + -2r = 15 Solving 3 + -2r = 15 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -2r = 15 + -3 Combine like terms: 3 + -3 = 0 0 + -2r = 15 + -3 -2r = 15 + -3 Combine like terms: 15 + -3 = 12 -2r = 12 Divide each side by '-2'. r = -6 Simplifying r = -6
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