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Simplifying -65x(-67 + -1r) = -520 (-67 * -65x + -1r * -65x) = -520 Reorder the terms: (65rx + 4355x) = -520 (65rx + 4355x) = -520 Solving 65rx + 4355x = -520 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4355x' to each side of the equation. 65rx + 4355x + -4355x = -520 + -4355x Combine like terms: 4355x + -4355x = 0 65rx + 0 = -520 + -4355x 65rx = -520 + -4355x Divide each side by '65x'. r = -8x-1 + -67 Simplifying r = -8x-1 + -67 Reorder the terms: r = -67 + -8x-1
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