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Simplifying 8r + -1 = r + -15 Reorder the terms: -1 + 8r = r + -15 Reorder the terms: -1 + 8r = -15 + r Solving -1 + 8r = -15 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. -1 + 8r + -1r = -15 + r + -1r Combine like terms: 8r + -1r = 7r -1 + 7r = -15 + r + -1r Combine like terms: r + -1r = 0 -1 + 7r = -15 + 0 -1 + 7r = -15 Add '1' to each side of the equation. -1 + 1 + 7r = -15 + 1 Combine like terms: -1 + 1 = 0 0 + 7r = -15 + 1 7r = -15 + 1 Combine like terms: -15 + 1 = -14 7r = -14 Divide each side by '7'. r = -2 Simplifying r = -2
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