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Simplifying -15 = 2r + -1 Reorder the terms: -15 = -1 + 2r Solving -15 = -1 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. -15 + -2r = -1 + 2r + -2r Combine like terms: 2r + -2r = 0 -15 + -2r = -1 + 0 -15 + -2r = -1 Add '15' to each side of the equation. -15 + 15 + -2r = -1 + 15 Combine like terms: -15 + 15 = 0 0 + -2r = -1 + 15 -2r = -1 + 15 Combine like terms: -1 + 15 = 14 -2r = 14 Divide each side by '-2'. r = -7 Simplifying r = -7
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