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Simplifying -6(r + -7) = 786 Reorder the terms: -6(-7 + r) = 786 (-7 * -6 + r * -6) = 786 (42 + -6r) = 786 Solving 42 + -6r = 786 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-42' to each side of the equation. 42 + -42 + -6r = 786 + -42 Combine like terms: 42 + -42 = 0 0 + -6r = 786 + -42 -6r = 786 + -42 Combine like terms: 786 + -42 = 744 -6r = 744 Divide each side by '-6'. r = -124 Simplifying r = -124
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