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Simplifying 7(-5r + -7) = 231 Reorder the terms: 7(-7 + -5r) = 231 (-7 * 7 + -5r * 7) = 231 (-49 + -35r) = 231 Solving -49 + -35r = 231 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '49' to each side of the equation. -49 + 49 + -35r = 231 + 49 Combine like terms: -49 + 49 = 0 0 + -35r = 231 + 49 -35r = 231 + 49 Combine like terms: 231 + 49 = 280 -35r = 280 Divide each side by '-35'. r = -8 Simplifying r = -8
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