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Simplifying -6(5r + -7) = -198 Reorder the terms: -6(-7 + 5r) = -198 (-7 * -6 + 5r * -6) = -198 (42 + -30r) = -198 Solving 42 + -30r = -198 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 + -30r = -198 + -42 Combine like terms: 42 + -42 = 0 0 + -30r = -198 + -42 -30r = -198 + -42 Combine like terms: -198 + -42 = -240 -30r = -240 Divide each side by '-30'. r = 8 Simplifying r = 8
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