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Simplifying -4(-8 + -2r) + -7 = 81 (-8 * -4 + -2r * -4) + -7 = 81 (32 + 8r) + -7 = 81 Reorder the terms: 32 + -7 + 8r = 81 Combine like terms: 32 + -7 = 25 25 + 8r = 81 Solving 25 + 8r = 81 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-25' to each side of the equation. 25 + -25 + 8r = 81 + -25 Combine like terms: 25 + -25 = 0 0 + 8r = 81 + -25 8r = 81 + -25 Combine like terms: 81 + -25 = 56 8r = 56 Divide each side by '8'. r = 7 Simplifying r = 7
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