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Simplifying 75 + 2r + 15 = 180 Reorder the terms: 75 + 15 + 2r = 180 Combine like terms: 75 + 15 = 90 90 + 2r = 180 Solving 90 + 2r = 180 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-90' to each side of the equation. 90 + -90 + 2r = 180 + -90 Combine like terms: 90 + -90 = 0 0 + 2r = 180 + -90 2r = 180 + -90 Combine like terms: 180 + -90 = 90 2r = 90 Divide each side by '2'. r = 45 Simplifying r = 45
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