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