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Simplifying 2r + 45 + r = 90 Reorder the terms: 45 + 2r + r = 90 Combine like terms: 2r + r = 3r 45 + 3r = 90 Solving 45 + 3r = 90 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-45' to each side of the equation. 45 + -45 + 3r = 90 + -45 Combine like terms: 45 + -45 = 0 0 + 3r = 90 + -45 3r = 90 + -45 Combine like terms: 90 + -45 = 45 3r = 45 Divide each side by '3'. r = 15 Simplifying r = 15
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