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Simplifying 450 = 2(r + 10) Reorder the terms: 450 = 2(10 + r) 450 = (10 * 2 + r * 2) 450 = (20 + 2r) Solving 450 = 20 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. 450 + -2r = 20 + 2r + -2r Combine like terms: 2r + -2r = 0 450 + -2r = 20 + 0 450 + -2r = 20 Add '-450' to each side of the equation. 450 + -450 + -2r = 20 + -450 Combine like terms: 450 + -450 = 0 0 + -2r = 20 + -450 -2r = 20 + -450 Combine like terms: 20 + -450 = -430 -2r = -430 Divide each side by '-2'. r = 215 Simplifying r = 215
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