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Simplifying -1(-5 + 2r) + 7r = 0 (-5 * -1 + 2r * -1) + 7r = 0 (5 + -2r) + 7r = 0 Combine like terms: -2r + 7r = 5r 5 + 5r = 0 Solving 5 + 5r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + 5r = 0 + -5 Combine like terms: 5 + -5 = 0 0 + 5r = 0 + -5 5r = 0 + -5 Combine like terms: 0 + -5 = -5 5r = -5 Divide each side by '5'. r = -1 Simplifying r = -1
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