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Simplifying -8(4 + -1r) = 40 (4 * -8 + -1r * -8) = 40 (-32 + 8r) = 40 Solving -32 + 8r = 40 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '32' to each side of the equation. -32 + 32 + 8r = 40 + 32 Combine like terms: -32 + 32 = 0 0 + 8r = 40 + 32 8r = 40 + 32 Combine like terms: 40 + 32 = 72 8r = 72 Divide each side by '8'. r = 9 Simplifying r = 9
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