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Simplifying -3(7r + 8) = 100 Reorder the terms: -3(8 + 7r) = 100 (8 * -3 + 7r * -3) = 100 (-24 + -21r) = 100 Solving -24 + -21r = 100 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '24' to each side of the equation. -24 + 24 + -21r = 100 + 24 Combine like terms: -24 + 24 = 0 0 + -21r = 100 + 24 -21r = 100 + 24 Combine like terms: 100 + 24 = 124 -21r = 124 Divide each side by '-21'. r = -5.904761905 Simplifying r = -5.904761905
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