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Simplifying -2(r + -8) + -7r = 0 Reorder the terms: -2(-8 + r) + -7r = 0 (-8 * -2 + r * -2) + -7r = 0 (16 + -2r) + -7r = 0 Combine like terms: -2r + -7r = -9r 16 + -9r = 0 Solving 16 + -9r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-16' to each side of the equation. 16 + -16 + -9r = 0 + -16 Combine like terms: 16 + -16 = 0 0 + -9r = 0 + -16 -9r = 0 + -16 Combine like terms: 0 + -16 = -16 -9r = -16 Divide each side by '-9'. r = 1.777777778 Simplifying r = 1.777777778
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