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Simplifying 7(-3r + 4) = 91 Reorder the terms: 7(4 + -3r) = 91 (4 * 7 + -3r * 7) = 91 (28 + -21r) = 91 Solving 28 + -21r = 91 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + -21r = 91 + -28 Combine like terms: 28 + -28 = 0 0 + -21r = 91 + -28 -21r = 91 + -28 Combine like terms: 91 + -28 = 63 -21r = 63 Divide each side by '-21'. r = -3 Simplifying r = -3
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