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Simplifying -15 = -1 + -2r + -6r Combine like terms: -2r + -6r = -8r -15 = -1 + -8r Solving -15 = -1 + -8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '8r' to each side of the equation. -15 + 8r = -1 + -8r + 8r Combine like terms: -8r + 8r = 0 -15 + 8r = -1 + 0 -15 + 8r = -1 Add '15' to each side of the equation. -15 + 15 + 8r = -1 + 15 Combine like terms: -15 + 15 = 0 0 + 8r = -1 + 15 8r = -1 + 15 Combine like terms: -1 + 15 = 14 8r = 14 Divide each side by '8'. r = 1.75 Simplifying r = 1.75
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