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Simplifying 3(-7r + -3) = 117 Reorder the terms: 3(-3 + -7r) = 117 (-3 * 3 + -7r * 3) = 117 (-9 + -21r) = 117 Solving -9 + -21r = 117 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -21r = 117 + 9 Combine like terms: -9 + 9 = 0 0 + -21r = 117 + 9 -21r = 117 + 9 Combine like terms: 117 + 9 = 126 -21r = 126 Divide each side by '-21'. r = -6 Simplifying r = -6
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